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Birds of Note All Records For Least Bittern
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| Least Bittern | 1992 | Jul-Sep | Philadelphia | At least 12 pairs nested at Tinicum this year (John Miller) |
| Least Bittern | 1993 | Apr-Jun | Erie | 1 on 4/9 (Jerry McWilliams); 13 on 4/15 (Jerry McWilliams, Ed Kwater) and 1 on 4/30 (Geoff Robinson). all at Presque Isle SP |
| Least Bittern | 1993 | Apr-Jun | Bucks | 1 each at Quakertown Swamp (A. Mirabella) and Churchville Park (C. Stieher) 5/8 |
| Least Bittern | 1994 | Jul-Sep | Erie | 1 was present part of the quarter |
| Least Bittern | 1994 | Oct-Dec | Berks | 1 at Red Bridge 8/24 (Joan Sutton) |
| Least Bittern | 1994 | Apr-Jun | Bucks | singles at Bowman's Hill 5/7 (George Carmichael) and at PV 5/14-16 (Ian Baldock) |
| Least Bittern | 1994 | Jul-Sep | Erie | all at Presque Isle; 1 on 5/5 (Jerry McWilliams); 4 on 6/5 (Jerry & Linda McWilliams); and 2 on 6/14 (Geoff Robinson) |
| Least Bittern | 1994 | Jul-Sep | Lancaster | 1 on the Conejohela Flats 6/4 (late) (Tom Garner, Eric Witmer) |
| Least Bittern | 1994 | Apr-Jun | Philadelphia | 1 at Tinicum 5/14 (Mary Carbone) |
| Least Bittern | 1995 | Jul-Sep | Berks | 3 on 5/17; 4 on 5/21; and 1 on 6/28 at Glen Morgan L. (Ken Lebo) |
| Least Bittern | 1995 | Apr-Jun | Erie | Present from 4/23 on at Presque Isle SP (Jerry McWilliams) |
| Least Bittern | 1995 | Jul-Sep | Philadelphia | 1 on 6/25 at Tinicum (Al Guarente) |
| Least Bittern | 1995 | Oct-Dec | Berks | 1 to 3 from 7/3 to 8/13 at Glen Morgan L. (Ken Lebo) |
| Least Bittern | 1995 | Jul-Sep | Delaware | 1 on 7/15 at Tinicum (Al Guarente) |
| Least Bittern | 1995 | Jul-Sep | Erie | present part of the period |
| Least Bittern | 1995 | Apr-Jun | Butler | 1 on 5/13 at Glades SGL (Gene Wilhelm) |
| Least Bittern | 1996 | Jul-Sep | Philadelphia | 1 on 7/4-8/10 at Tinicum (Jim McKinney, Ed Fingerhood) |
| Least Bittern | 1996 | Oct-Dec | Indiana | 1 on 8/3 and 4 on 8/10 at Yellow Creek SP (Lee Carnahan) |
| Least Bittern | 1996 | Jul-Sep | Warren | 1 on 7/5 at Akeley Swamp (Mary Grishaver) |
| Least Bittern | 1996 | Jul-Sep | Berks | 1 on 7/5-24 at Glen Morgan Lake (Ken Lebo) |
| Least Bittern | 1996 | Jul-Sep | Erie | 1 on 7/17 at Presque Isle SP (Geoff Robinson) |
| Least Bittern | 1997 | Oct-Dec | Bucks | 1 on 10/7 at Silver L. (George Carmichael) |
| Least Bittern | 1998 | Oct-Dec | Philadelphia | Present up to 8/22 at Tinicum NWR |
| Least Bittern | 1998 | Oct-Dec | Delaware | Present all quarter with a high of 3 on 8/28 at Darby Creek (Al Guarente) |
| Least Bittern | 1999 | Apr-Jun | Berks | 1 on 4/18 at Blue Marsh Lake (Jim Eckert) |
| Least Bittern | 1999 | Jul-Sep | Delaware | 1 on 7/12 at Darby Creek (Tom McParland) |
| Least Bittern | 1999 | Apr-Jun | Erie | Present from 5/7 at Presque Isle SP (John Fedak) |
| Least Bittern | 1999 | Apr-Jun | Philadelphia | Present all quarter with a high of 10 at Tinicum (John Miller) |
| Least Bittern | 1999 | Jul-Sep | Erie | Present part of the quarter |
| Least Bittern | 1999 | Oct-Dec | Philadelphia | Present up to Aug at Tinicum |
| Least Bittern | 1999 | Apr-Jun | Westmoreland | 1 on 5/19-22 at Powdermill Nature Reserve (Bob Leberman, Bob Mulvihill, Jim Gruber) |
| Least Bittern | 1999 | Jul-Sep | Berks | 1 on 7/12 at Glen Morgan Lake (Peter Robinson) |
| Least Bittern | 2000 | Jul-Sep | Delaware | Present part of the quarter |
| Least Bittern | 2000 | Oct-Dec | Philadelphia | Present up to 8/12 at John Heinz NWR at Tinicum |
| Least Bittern | 2000 | Oct-Dec | Philadelphia | 1 on 10/3 at Tinicum (m. obs.) |
| Least Bittern | 2000 | Jul-Sep | Erie | Present part of the quarter |
| Least Bittern | 2000 | Jul-Sep | Cambria | 1 on 7/7 at Prince Gallitzin State Park (John Salvetti) |
| Least Bittern | 2001 | Jul-Sep | Berks | 2 present 5/11 to 6/8 at Glen Morgan Lake (Ken Lebo) |
| Least Bittern | 2001 | Jul-Sep | Erie | 2 from 5/4 to 6/7 at Presque Isle State Park (Mike Fialkovich, Jerry McWilliams, Bob Grubbs) |
| Least Bittern | 2001 | Apr-Jun | Lancaster | 2 present 5/25-29 at the Conejohela Flats (Bob Schutsky) |
| Least Bittern | 2001 | Apr-Jun | Philadelphia | present in April |
| Least Bittern | 2001 | Apr-Jun | Westmoreland | 1 on 5/24-25 at Powdermill Nature Reserve (Bob Leberman, Bob Mulvihill, Jim Gruber, M Shaffer) |
| Least Bittern | 2001 | Jul-Sep | Dauphin | 8/23-28 Present where it breeds in Erie and Philadelphia, where fledglings from six nests foraged at the edge of the J. Heinz Refuge impoundment (J Miller, K Somerville) |
| Least Bittern | 2001 | Apr-Jun | Chester | 1 at Marsh Creek (John McNamara) |
| Least Bittern | 2001 | Apr-Jun | Bedford | 1 on 5/20 at Shawnee State Park (Ross Galardy) |
| Least Bittern | 2002 | Jul | Bucks | a pair seen 7/6 through 7/20, was believed to be nesting at Nockamixon State Park |
| Least Bittern | 2002 | Jul | Chester | Seen on 7/3 at Marsh Creek State Park (J. McNamara) |
| Least Bittern | 2002 | Aug-Nov | Philadelphia | A nest with 3 hatchlings was found 8/10 in the refuge impoundment on spatterdock (Nuphar lutea v, advena) and viewed by many from the dike |
| Least Bittern | 2002 | Aug-Nov | Bedford | 1 on 9/11 at Dunnings Creek Wetlands |
| Least Bittern | 2002 | Aug-Nov | Lancaster | 1 on 10/26 at Woods Edge Pond (Bruce Carl) |
| Least Bittern | 2002 | Aug-Nov | Philadelphia | 3 on 8/10 at John Heinz National Wildlife Refuge. The 3 individuals observed were hatchlings in a nest on a refuge impoundment |
| Least Bittern | 2003 | Jun-Jul | Bedford | Two observed on 6/7 and appeared to nest in a remote flooded area of Dunnings Creek Wetlands (Tom Dick) |
| Least Bittern | 2003 | Aug-Nov | Lancaster | One 8/6 Middlecreek WMA (B. Carl) |
| Least Bittern | 2003 | Aug-Nov | Westmoreland | One 10/12 Powdermill Nature Preserve (M. Lanzone) |
| Least Bittern | 2004 | Jun-Jul | Luzerne | heard at Lee's swamp at Loyalville (Rick Koval, Jim Hoyson) |
| Least Bittern | 2004 | Jun-Jul | Philadelphia | Young from one of the broods were present in the "horseshoe"in the Tinicum National Wildlife Refuge |
| Least Bittern | 2004 | Jun-Jul | Armstrong | 1 on 7/8 one flew across the marsh area of Keystone Reservoir (Carol Guba, Margaret Higbee). relocated 7/18 (Dennis Lauffer) and again on 7/19 (Carol Guba, Margaret Higbee) |
| Least Bittern | 2004 | Jun-Jul | Berks | on 6/4 a record 7 were heard (Ken Lebo) at Glen Morgan Lake |
| Least Bittern | 2004 | Jun-Jul | Erie | 1 seen at Niagara Pond on Presque Isle on 6/12 (Mark Vass) |
| Least Bittern | 2004 | Jun-Jul | Snyder | Seen near Selinsgrove on 6/2 (Mick Brown). |
| Least Bittern | 2005 | Mar-May | Westmoreland | one at St. Vincent Wetlands, Latrobe 5/10 (fide Tim Vechter); one at Powdermill Nature Reserve 5/15 (Emma DeLeon) |
| Least Bittern | 2005 | Aug-Nov | Erie | three were reported from Leo's Landing 8/5 while another or one of the group was present there 9/3 (Mark Vass) |
| Least Bittern | 2005 | Mar-May | Berks | three at Glen Morgan Lake 5/13 (Ken Lebo) |
| Least Bittern | 2005 | Mar-May | Erie | up to five at Presque Isle State Park 5/8-28 (Ben Coulter, Jerry McWilliams) |
| Least Bittern | 2005 | Mar-May | Lebanon | one at Calvary Dam 5/21 (Randy Miller, Kate Miller) |
| Least Bittern | 2005 | Mar-May | Bedford | one at Dunnings Creek Wetlands 5/5 (Tom Dick) |
| Least Bittern | 2006 | Jun-Jul | Bedford | An adult and chick were observed on a small mudflat 7/16 at Dunning Creek Wetland (Tom Dick) |
| Least Bittern | 2006 | Jun-Jul | Crawford | Located at Geneva 6/17 (Robert C. Leberman) 6/4 at Hartstown (Mark Vass) and 2 (1 ad. 1 young) were seen at Custards 6/30 (Bob Van Newkirk) |
| Least Bittern | 2006 | Jun-Jul | Montgomery | Apparently nested at a pond in eastern Montgomery where at least 3 birds (including juveniles) were present in July |
| Least Bittern | 2006 | Aug-Nov | Washington | A juvenile was at Greencove Wetlands 8/10 (Ross Gallardy). |
| Least Bittern | 2006 | Aug-Nov | Bedford | 3 were seen 8/6 at Dunnings Creek Wetlands (Tom Dick) |
| Least Bittern | 2006 | Aug-Nov | Berks | One at Blue Marsh Lake 8/18 (JS) provided a very rare fall record |
| Least Bittern | 2006 | Aug-Nov | Lancaster | One was observed on multiple locations on the Conejohela Flats from 8/26-9/28 |
| Least Bittern | 2006 | Aug-Nov | Philadelphia | One seen 8/29 at Tinicum Refuge. |
| Least Bittern | 2006 | Aug-Nov | Cumberland | Nest with 2 young in State Game Lands # 169 on 8/10 (Andy Markel John Dunn) |
| Least Bittern | 2007 | Jun-Jul | Lancaster | Calling from the lower end of Sharptail Island.Conejohela Flats 7/5 (Bruce Carl Bob Schutsky) |
| Least Bittern | 2007 | Mar-May | Bucks | one at Bristol 5/12 (Bob Mercer) |
| Least Bittern | 2007 | Mar-May | Chester | one at Marsh Creek S.P. 5/29 (John McNamara) |
| Least Bittern | 2007 | Mar-May | Erie | two at Presque Isle S.P. 5/17-5/23 (Jerry McWilliams) |
| Least Bittern | 2007 | Mar-May | Berks | 4 heard at Glen Morgan L. 5/11 (Ken Lebo) |
| Least Bittern | 2007 | Aug-Nov | Bucks | An injured bird found at Kintnersville 9/9 was turned over to a rehabilitator but died shortly thereafter. |
| Least Bittern | 2007 | Mar-May | Philadelphia | two heard during the season at John Heinz National Wildlife Refuge at Tinicum. |
| Least Bittern | 2007 | Jun-Jul | Warren | at least 2 individuals responded to playback 6/6 at Akeley Swamp (John Fedak). |
| Least Bittern | 2007 | Aug-Nov | Cumberland | Two at SGL 169 on 9/29 (Andrew Markel, Bob Keener). |
| Least Bittern | 2007 | Aug-Nov | Westmoreland | one trapped and banded at Powdermill Nature Reserve 10/5 (Adrienne Leppold, Pam Ferkett). |
| Least Bittern | 2007 | Jun-Jul | Delaware | at the Tinicum mitigation area along Darby Creek 6/10 (Al Guarente) |
| Least Bittern | 2007 | Jun-Jul | Erie | calling and seen in flight at Presque Isle 6/25 (Tom Johnson) |
| Least Bittern | 2007 | Jun-Jul | Bucks | Calling at Quakertown Swamp 6/2-15 (Mike Tanis Bill Etter August Mirabella) and another at Rohm and Haas Bristol 7/1 continuing from May (Devich Farbotnik) |
| Least Bittern | 2007 | Jun-Jul | Crawford | a pair calling at Geneva (Ronald F. Leberman) |
| Least Bittern | 2008 | Aug-Nov | Bucks | one at Peace Valley Park 8/21 (Susan Charkes) |
| Least Bittern | 2008 | Aug-Nov | Erie | one at the head of Presque Isle Bay 8/24-30 (Michele Franz, Julie Leonard). |
| Least Bittern | 2008 | Jun-Jul | Warren | One bird heard callingnear Akely Swamp 6/17 (Andy Wilson, Atlas). |
| Least Bittern | 2008 | Jun-Jul | Bucks | Discovered 6/15-22 at U.S. Steel inFalls Twp. (Devich Farbotnik) |
| Least Bittern | 2008 | Jun-Jul | Cumberland | 2 pairs atMountain Road marsh at SGL 169 (Andrew Markel) |
| Least Bittern | 2008 | Jun-Jul | Philadelphia | One photographed at John Heinz N.W.R. 7/14 (Todd Fellenbaum) |
| Least Bittern | 2009 | Mar-May | Bucks | one at Quakertown Swamp 5/16 through the reporting period (Devich Farbotnik) |
| Least Bittern | 2009 | Mar-May | Crawford | one at the Pymatuning Goose Management Area 5/6 (observer not listed), one at Geneva Marsh 5/24 (Mike Fialkovich, Jim Valimont) |
| Least Bittern | 2009 | Mar-May | Erie | a pair at a nest 5/8 through the end of the reporting period (Don Snyder, m.ob.) |
| Least Bittern | 2009 | Mar-May | Luzerne | one in Bear Creek Township 3/25 (Mark Kasper) |
| Least Bittern | 2009 | Mar-May | Philadelphia | a pair at John Heinz National Wildlife Refuge at Tinicum 5/9 to the end of the season (Greg Gorton). |
| Least Bittern | 2009 | Mar-May | Berks | one calling at Peter's Creek 5/30 (Jim Eckert) |
| Least Bittern | 2009 | Jun-Jul | Bucks | Two were heard at Quakertown Swamp 6/9-11 (Devich Farbotnik) |
| Least Bittern | 2009 | Jun-Jul | Cumberland | At SGL169 on 7/26 (Vern Gauthier) |
| Least Bittern | 2009 | Jun-Jul | Erie | Continued to be reported at Presque Isle State Park through the period (m.ob.). |
| Least Bittern | 2011 | Jun-Jul | Bucks | one at Quakertown Swamp 6/7 (Devich Farbotnik) |
| Least Bittern | 2011 | Jun-Jul | Juniata | single bird was sighted in Mifflintown, at Kratzer's Pond (Raymond Swarey, Aden Troyer, Stevie Troyer). |
| Least Bittern | 2011 | Mar-May | Bedford | three at Dunnings Creek Wetlands 5/21 (Tom Dick, et al.) |
| Least Bittern | 2011 | Mar-May | Berks | one in Maxatawny Twp. 5/22-25 (Bruce Williams, Drew Weber) |
| Least Bittern | 2011 | Mar-May | Cambria | one at Prince Gallitzin State Park 5/20 (Margaret Higbee) |
| Least Bittern | 2011 | Mar-May | Carbon | one at Lehigh Gap Nature Center 5/1 (Dave Levandusky) |
| Least Bittern | 2011 | Mar-May | Huntingdon | one at Old Crow Wetland 5/4 (Tim Zador) |
| Least Bittern | 2011 | Jun-Jul | Philadelphia | reported at the John Heinz National Wildlife Refuge at Tinicum the entire season. |
| Least Bittern | 2011 | Jun-Jul | Adams | one at SGL 249 on 6/19 (Don and Jennifer Gilbert) |
| Least Bittern | 2011 | Jun-Jul | Berks | first reported 5/22 in Maxatawny Twp. was last reported 6/1 (Robert Essick) |
| Least Bittern | 2012 | Mar-May | Erie | See County report |
| Least Bittern | 2012 | Mar-May | Bradford | See County report |
| Least Bittern | 2012 | Mar-May | Clinton | See County report |
| Least Bittern | 2012 | Mar-May | Franklin | See County report |
| Least Bittern | 2012 | Jun-Jul | Philadelphia | 6/23 four adults were seen at Tinicum, and on 7/11 there were 3 chicks at a nest (Adrian Binns, m.ob.). |
| Least Bittern | 2012 | Mar-May | Huntingdon | See County report |
| Least Bittern | 2012 | Mar-May | Bedford | See County report |
| Least Bittern | 2012 | Jun-Jul | Chester | documented nesting in the county this summer, but site withheld |
| Least Bittern | 2012 | Jun-Jul | Crawford | 7/22 (Shawn Collins) at McMichael Road, and one at Shellito's Pond 7/29 (Ron F. Leberman) |
| Least Bittern | 2012 | Jun-Jul | Huntingdon | Marklesburg Waterfowl Area 6/6 (Chuck Yohn) |
| Least Bittern | 2013 | Mar-May | Philadelphia | one at Darby Creek 4/27-28 (Debbie Beer, et al.). |
| Least Bittern | 2013 | Mar-May | Huntingdon | one at Old Crow Wetland 4/28 (Greg Grove) |
| Least Bittern | 2013 | Jun-Jul | Erie | 2 at the head of Presque Isle Bay 6/15 (Mark Vass) |
| Least Bittern | 2013 | Mar-May | Berks | one calling at Glen Morgan Lake IBA 5/17 (Ken Lebo, Matt Wlasniewski) |
| Least Bittern | 2013 | Mar-May | Cumberland | one at State Game Lands 169, Mountain Road Marsh 5/11 (Andrew Markel, Dan Snell) |
| Least Bittern | 2013 | Mar-May | Erie | two at Presque Isle State Park 5/27 (Shannon Thompson) |
| Least Bittern | 2013 | Mar-May | Susquehanna | one at an undisclosed location 5/12 (Jerry Skinner) |
| Least Bittern | 2013 | Jun-Jul | Lancaster | one heard at the Conejohela Flats 7/27 (Bob Schutsky, Justin Bosler) |
| Least Bittern | 2013 | Jun-Jul | Philadelphia | many sightings in June and July at John Heinz N.W.R. at Tinicum, including 2 adults with 4 chicks on nest 6/21 (Adrian Binns, m.ob.). |
| Least Bittern | 2013 | Mar-May | Bedford | first of the season heard at Dunnings Creek Wetlands 4/14 (Tom Dick) |
| Least Bittern | 2013 | Jun-Jul | Dauphin | 2 near Cummings Swamp just north of Millersburg 7/27 (Jim Flowers) |
| Least Bittern | 2014 | Jun-Jul | Philadelphia | reported throughout the season at John Heinz National Wildlife Refuge at Tinicum (m.ob.). |
| Least Bittern | 2014 | Jun-Jul | Erie | one calling 6/5 (Greg Lawrence, eBird) and another 7/30 (Matt Sabatine) |
| Least Bittern | 2014 | Mar-May | Allegheny | one at Imperial 5/31 (ph. Geoff Malosh, Michael David) |
| Least Bittern | 2014 | Mar-May | Berks | one at Kernsville Dam Recreation Area 4/27-5/7 (Kerry Grim) |
| Least Bittern | 2014 | Mar-May | Cumberland | one at SGL 169 on 5/30 (Vern Gauthier) |
| Least Bittern | 2014 | Mar-May | Erie | one at Presque Isle State Park 5/18 (Jerry McWilliams) |
| Least Bittern | 2014 | Mar-May | Lebanon | one at Fort Indiantown Gap 5/15 (Dave McNaughton) and 5/21 (Jarrod Derr, Dave McNaughton, Chris Bortz, Timothy Becker) |
| Least Bittern | 2014 | Mar-May | Philadelphia | first noted for the season at John Heinz National Wildlife Refuge at Tinicum 5/17 (Kay Meng, Gary Jarvis). |
| Least Bittern | 2014 | Jun-Jul | Berks | at Blue Marsh Lake 7/30 (Joan Silagy) |
| Least Bittern | 2014 | Jun-Jul | Crawford | at Conneaut Marsh at Watson Run Rd. 6/1 (Billy Weber, listserv) and at SGL 214 during a PGC survey 5/30 (Roger Coup) |
| Least Bittern | 2015 | Jun-Jul | Delaware | one at John Heinz National Wildlife Refuge 6/5, (Damon Orsetti) |
| Least Bittern | 2015 | Jun-Jul | Erie | a pair near the head of Presque Isle Bay 6/11 (Brian Berchtold) |
| Least Bittern | 2015 | Jun-Jul | Huntingdon | one at Marklesburg waterfowl area 6/14-16 (Greg Grove, Deb Grove) |
| Least Bittern | 2015 | Jun-Jul | Philadelphia | up to 7 at John Heinz NWR 6/13-7/30 (Doris McGovern, Paul Bernhardt, m.ob.). |
| Least Bittern | 2015 | Aug-Nov | Philadelphia | nested at John Heinz N.W.R. with 7 birds present at the beginning of Aug (Paul Bernhardt). |
| Least Bittern | 2015 | Mar-May | Cumberland | one at Huntsdale Hidden Pond 5/13 (Vern Gauthier, Ted Nichols) |
| Least Bittern | 2015 | Mar-May | Dauphin | one at Wildwood Lake 5/21 (Ed Bernot) |
| Least Bittern | 2015 | Aug-Nov | Delaware | one at John Heinz N.W.R. 8/10 (Damon Orsetti) |
| Least Bittern | 2015 | Aug-Nov | Luzerne | one perched in a shrub on a ridge top in Laurel Run 9/11 (Rick Koval) |
| Least Bittern | 2015 | Mar-May | Delaware | one at John Heinz National Wildlife Refuge 5/18 (Al Guarente) |
| Least Bittern | 2015 | Mar-May | Erie | one at Niagara Pond at Presque Isle State Park 5/18 (Russ States) |
| Least Bittern | 2015 | Mar-May | Juniata | one at Kratzers Ponds 5/2 (Chad Kauffman, Ramsay Koury, Annette Matthes, Aden Troyer) |
| Least Bittern | 2015 | Mar-May | Northampton | one at the Gremar Road Ponds 5/17 (Matt Sabatine) |
| Least Bittern | 2015 | Mar-May | Philadelphia | at John Heinz National Wildlife Refuge beginning 4/30 (Mike Rosengarten) |
| Least Bittern | 2015 | Mar-May | Somerset | one at Somerset Lake 5/14 (Mike Lanzone). |
| Least Bittern | 2016 | Aug-Nov | Lawrence | one continuing from summer at BlackSwamp 8/25 (Brendyn Baptiste) |
| Least Bittern | 2016 | Aug-Nov | Montgomery | one recorded on nocturnal migration over Elkins Park 9/12 (Paul Driver). |
| Least Bittern | 2016 | Jun-Jul | Erie | one at Presque Isle SP 6/25 and 7/5 (Jim Flynn and Steve Dowland), and at Leo's landing (Don Synder, Jim Flynn) |
| Least Bittern | 2016 | Jun-Jul | Lawrence | at Black Swamp 6/14 (Gene Wilhelm, Joanne Wilhelm) |
| Least Bittern | 2016 | Jun-Jul | Philadelphia | adults with 2 juveniles seen flying at John Heinz NWR 6/23 (Frank Windfelder, m.ob., ph.). |
| Least Bittern | 2016 | Jun-Jul | Crawford | one at Custards Marsh 6/18 (Mary Higbee) |
| Least Bittern | 2017 | Jun-Jul | Chester | a vocal bird detected in late May at Marsh Creek SP continued into early June, not detected again until 7/30, with no evidence of nesting |
| Least Bittern | 2017 | Jun-Jul | Crawford | one seen at Conneaut Marsh-McMichael Rd 6/18 (Anne Jacobs, Chris Lundberg) and one at Geneva Marsh 6/23 (Josh Lefever) |
| Least Bittern | 2017 | Jun-Jul | Cumberland | two were flushed at propagation ponds at SGL 169 on 7/23 (Andrew Markel) |
| Least Bittern | 2017 | Jun-Jul | Delaware | reliably found at John Heinz NWR where there were 4 reports this season 6/9 from the spadderdock off the new boardwalk (Jim McConnell), 6/10 (Al Guarente), and on 6/23, 28 (Jim McConnell) (see Philadelphia) |
| Least Bittern | 2017 | Jun-Jul | Erie | reported to eBird 6/2-7/4 at various locations (m.ob.) |
| Least Bittern | 2017 | Jun-Jul | Northumberland | at Amish Pond, first heard calling 6/5 (Evan Houston), observed through 6/10 (Lauren Shaffer, m.ob.) |
| Least Bittern | 2017 | Jun-Jul | Philadelphia | sightings of 7 birds of various ages at John Heinz NWR 7/22-23, suggested there were 2 successful clutches and possibly a third pair (Holly Merker, Todd Fellenbaum, George Armistead) |
| Least Bittern | 2017 | Jun-Jul | Tioga | continuing to 6/3 in The Muck, Marsh Creek (Deuane Hoffman, eBird) |
| Least Bittern | 2017 | Jun-Jul | York | heard frequently calling at Brunner Island 6/1-6 (Lou Carpenter, Dick Cleary, m.ob.), a second one was at Lock 12 on 6/8 (Dean Newhouse). |
| Least Bittern | 2017 | Aug-Nov | Crawford | one at McMichael Road 8/7 (AnthonyBruno, Margaret Higbee, Roger Higbee) |
| Least Bittern | 2017 | Aug-Nov | Delaware | one at John Heinz N.W.R. 8/31 (Jim McConnell) |
| Least Bittern | 2017 | Mar-May | Delaware | one at John Heinz NWR 5/21 (Jim McConnell) |
| Least Bittern | 2017 | Mar-May | Berks | one at Kernsville Dam Recreation Area 5/9 (MTGrobe, Matt Wlasniewski, Jane Wolfe, Peter Wolfe) |
| Least Bittern | 2017 | Mar-May | Crawford | 3 at Conneaut Marsh on McMichael Rd 5/15 (Chris Lundberg) andone there 5/30 (Michael Schall) |
| Least Bittern | 2017 | Aug-Nov | Erie | one at Leo's Landing 8/16-9/24 (Brendyn Baptiste, et al., eBird) |
| Least Bittern | 2017 | Aug-Nov | Huntingdon | at least one adult and 2 juveniles at the Cornpropst Mills wetland 8/8-31 (Greg Grove, Lewis Grove, Deb Grove) |
| Least Bittern | 2017 | Aug-Nov | Philadelphia | 4 juveniles at John Heinz N.W.R. fledged from anest at the refuge from summer with reports through early Sep (m.ob.), and one there 9/17 (George Armistead, eBird) and 9/24(Debbie Beer, eBird). |
| Least Bittern | 2017 | Mar-May | Erie | present 5/6 through the season at various locations (m.ob.) |
| Least Bittern | 2017 | Mar-May | Huntingdon | one at Old Crow Wetland 5/21-26 (Renee Lubert, David Kyler, Trudy Kyler, Greg Grove,ph) |
| Least Bittern | 2017 | Mar-May | Tioga | one at the Muck 5/18-21 (Jim Florentino, Bruce Carl,m.ob., audio). |
| Least Bittern | 2018 | Aug-Nov | Bucks | one at Pine Run Dam 10/6 (Paul Heveran) |
| Least Bittern | 2018 | Aug-Nov | Centre | one at Muddy Paws Marsh 8/11 (Joe Gyekis, Carl Engstrom, Julia Plummer) |
| Least Bittern | 2018 | Aug-Nov | Montgomery | one at Green Lane Park 8/20 (Rudolph Keller) |
| Least Bittern | 2018 | Aug-Nov | Northampton | one injured bird found in residential Nazareth 8/7 was taken to rehabilitator, its fate was unknown |
| Least Bittern | 2018 | Aug-Nov | Philadelphia | one at John Heinz N.W.R. 8/2-9 (Jamie Zigarelli). |
| Least Bittern | 2019 | Jun-Jul | Crawford | reportedly becoming more common, with a single at Geneva Marsh 6/8 and 6/29 (Chuck Gehringer), and one at Conneaut Marsh-McMichael Road 7/2 (Justin Berkheimer, Jennifer Ferrick) and 7/7 (Shannon Thompson) |
| Least Bittern | 2019 | Jun-Jul | Delaware | two on multiple dates in July (m.ob.) |
| Least Bittern | 2019 | Jun-Jul | Montgomery | one at a Plymouth Meeting wetland 7/27 (Dave Belford) and 2 on 7/31 (Paul Driver) |
| Least Bittern | 2019 | Aug-Nov | Mercer | one at Greenville 9/10 (Michael Williams) |
| Least Bittern | 2019 | Aug-Nov | Montgomery | 2 at Plymouth Meeting 8/1-23 (Dave Belford, Paul Driver, m.ob.) and one at Wissahickon Waterfowl Preserve 9/4 (Jack McBrearty) |
| Least Bittern | 2019 | Aug-Nov | Philadelphia | one at John Heinz N.W.R. 8/3-11 (m.ob., eBird). |
| Least Bittern | 2019 | Mar-May | Centre | one at Scotia Barrens 5/18-30 (Joe Gyekis, et al.) |
| Least Bittern | 2019 | Mar-May | Crawford | one at The Wells in Geneva Marsh 5/4 (Isaac Field, Steve Rotkovecz), one at Geneva Marsh 5/10 (Thomas Nonnenmacher) and 5/24 (Jason Horn), one at Geneva Marsh, McMichael Rd. 5/27 (Claire Nicolls) |
| Least Bittern | 2019 | Mar-May | Cumberland | 2 at SGL 69 Mountain Rd. Marsh 5/7-12 (Andrew Markel, m.ob.) |
| Least Bittern | 2019 | Mar-May | Philadelphia | one at John Heinz NWR at Tinicum regularly since 4/18 and 3 there 5/18 (Sara Busch). |
| Least Bittern | 2019 | Jun-Jul | Washington | one photographed at Canonsburg Lake 6/4 (Sayre Greenfield). |
| Least Bittern | 2019 | Aug-Nov | Centre | 2 detected by nocturnal flight call at Bellefonte 9/1 (Julia Plummer) |
| Least Bittern | 2019 | Aug-Nov | Delaware | one at John Heinz N.W.R. 8/9 (Rich Ziegler) |
| Least Bittern | 2019 | Aug-Nov | Erie | one or 2 at Gull Point 8/9-9/20 (Justin Berkheimer, m.ob., eBird) |
| Least Bittern | 2020 | Aug-Nov | Erie | one at Gull Point 8/23-9/16 (Jennifer Ferrick, eBird). |
| Least Bittern | 2021 | Aug-Nov | Delaware | one at Hog Island 8/3 (Adrian Binns, Al Guarente, Sara Busch), one at John Heinz NWR 8/14 (John Zygmunt) and one at Memorial Park and Mineral Hill 8/18 (Micah Muldowney) |
| Least Bittern | 2021 | Aug-Nov | Montgomery | nocturnal flight calls recorded at Franconia Twp. 9/10 and 9/28 (Scott Godshall) |
| Least Bittern | 2021 | Aug-Nov | Philadelphia | 4 at Southwest Water Treatment Plant 8/6-27 indicating successful breeding (Debbie Beer, Holger Pflicke, Victoria Sindlinger) and one in South Philadelphia 9/19. |
| Least Bittern | 2022 | Aug-Nov | Centre | one detected by NFC in State College 8/12 (Joe Gyekis) |
| Least Bittern | 2022 | Aug-Nov | Delaware | one at John Heinz NWR 8/1-16 (Rich Ziegler, et al.) |
| Least Bittern | 2022 | Aug-Nov | Montgomery | one in Whitemarsh Twp. 8/28 (Dave Belford), and singles detected by NFC at Fischer's Park 8/27 (Scott Godshall) and Elkins Park 9/15 (Paul Driver) |
| Least Bittern | 2022 | Aug-Nov | Northampton | successfully nested at Minsi Lake 7/26-8/28 (John Munson, Guy de Bruyn) |
| Least Bittern | 2022 | Aug-Nov | Philadelphia | one at John Heinz NWR 8/4-9/18 (m.ob.) and as many as 6 (Debbie Beer) at the Southwest Philadelphia WTP 8/5-10/12 some of which were juveniles |
| Least Bittern | 2022 | Aug-Nov | Pike | one at Shohola WMA 8/7 (Chris Fischer) |
| Least Bittern | 2022 | Aug-Nov | Tioga | one at the Muck 9/1 (Andy Keister) |
| Least Bittern | 2022 | Aug-Nov | Wayne | one at Hankins Pond 8/7 (David Trently, David LaVerne) and up to 3 at White Oak Park 8/2-8 (Chris Fischer, John Harvey) |
| Least Bittern | 2022 | Aug-Nov | Westmoreland | one banded at Powdermill Nature Reserve 8/26 (Kevin Pero). |
| Least Bittern | 2023 | Aug-Nov | Adams | up to five at Gettysburg National Military Park 8/21-9/12 (Michael Schwanebeck, Tony Arnold, Evan Vaeth, Mike Cote, Jessica Ferguson) |
| Least Bittern | 2023 | Aug-Nov | Bucks | detected by nocturnal flight call at Quakertown 9/15 and 9/21 (Cody Peters) |
| Least Bittern | 2023 | Aug-Nov | Centre | detected by nocturnal flight call in State College 8/28 and 9/10 (Joe Gyekis) and in Bellefonte 9/14 (Julia Plummer) |
| Least Bittern | 2023 | Aug-Nov | Delaware | recorded at John Heinz NWR 8/4-13 (m.ob.) and via nocturnal flight call at Garnet Valley 9/20 (Ethan Kang) |
| Least Bittern | 2023 | Aug-Nov | Erie | one at Presque Isle 8/9 (Ripley Kindervater) and 9/12 (Jason Bojczyk) |
| Least Bittern | 2023 | Aug-Nov | Montgomery | noted via nocturnal flight call from four different locations 8/20-9/17 (m.ob.) |
| Least Bittern | 2023 | Aug-Nov | Philadelphia | two juveniles were noted at the Southwest Water Treatment Plant 8/18 (Adrian Binns, Debbie Beer) |
| Least Bittern | 2023 | Aug-Nov | Pike | one at Shohola Wildlife Management Area 8/17 (Chris Fischer, Bradley White, Ryan Johnson) |
| Least Bittern | 2023 | Aug-Nov | Wayne | one at White Oak Pond 8/30 (Chris Fischer). |