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Birds of Note All Records For Lesser Black-backed Gull
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| Lesser Black-backed Gull | 1992 | Oct-Dec | Erie | 1 at Presque Isle 12/10-22 (J. McWilliams, B. Schutsky) |
| Lesser Black-backed Gull | 1992 | Oct-Dec | Erie | One on 9/17 at Presque Isle SP Bob Schutsky |
| Lesser Black-backed Gull | 1992 | Oct-Dec | Berks | 1 over Hawk Mt. 11/16+ (v. obs.); 2 on the Reading CBC 12/20 |
| Lesser Black-backed Gull | 1993 | Apr-Jun | Bucks | seen on 5/8 |
| Lesser Black-backed Gull | 1993 | Jan-Mar | Lancaster | 1 at Pinnacle Peak 10/9 and 4 at Safe Harbor 12/28-31 (J. Heller) |
| Lesser Black-backed Gull | 1993 | Jan-Mar | Erie | 1 at Presque Isle 12/12 (J. McWilliams) |
| Lesser Black-backed Gull | 1993 | Jan-Mar | Bucks | 16 on the S. Bucks CBC 12/18 |
| Lesser Black-backed Gull | 1993 | Apr-Jun | Erie | 1 seen 4/12-27 at Presque Isle SP (Jerry McWilliams) |
| Lesser Black-backed Gull | 1993 | Apr-Jun | Montgomery | 1 on 4/9 at Green Lane Res. may be the first county record (Gary Freed, Larry Rhoads) |
| Lesser Black-backed Gull | 1993 | Jan-Mar | Berks | 1 at Blue Marsh L. 12/19 (Harold & Joan Silagy) and 1 at Reading 12/27 (Dean Kendall) |
| Lesser Black-backed Gull | 1994 | Apr-Jun | Bucks | 1 at Peace Valley until 4/9 (August Mirabella) |
| Lesser Black-backed Gull | 1994 | Apr-Jun | Erie | 1 at Presque Isle 5/1 (Jerry McWilliams) |
| Lesser Black-backed Gull | 1995 | Apr-Jun | Erie | 4 on 4/6-9 at Presque Isle SP (Jerry McWilliams) |
| Lesser Black-backed Gull | 1995 | Apr-Jun | Lancaster | 1 on 4/8 at Conowingo Pond (Early Bird Nature Tours) |
| Lesser Black-backed Gull | 1995 | Oct-Dec | Berks | Seen at L. Ontelaunee from 10/29 (Matt Spence) to 11/24 (2) (Dean Kendall) |
| Lesser Black-backed Gull | 1995 | Jan-Mar | Bucks | 12 on 12/16 (Bob Mercer) |
| Lesser Black-backed Gull | 1995 | Jan-Mar | Erie | 1 on 11/24 (Ed Kwater) and 1 on 12/12 (Jerry McWillams) at Presque Isle SP |
| Lesser Black-backed Gull | 1995 | Jan-Mar | Lancaster | 2 present from 11/26 on with a high of 5 on 12/30 at Safe Harbor (Lancaster CBC) |
| Lesser Black-backed Gull | 1995 | Jan-Mar | Allegheny | 1 present from 12/30 on at Allegheny River(Ted Floyd, Paul Hess) |
| Lesser Black-backed Gull | 1995 | Apr-Jun | Bucks | present from 5/6 to 5/13 with a high of 20 on 5/13 (no loc, no obs.) |
| Lesser Black-backed Gull | 1995 | Apr-Jun | Berks | 1 on 4/2 at L. Ontelaunee (Matt Spence) |
| Lesser Black-backed Gull | 1996 | Apr-Jun | Erie | 1 on 4/6 at Presque Isle SP (Ed Kwater) |
| Lesser Black-backed Gull | 1996 | Apr-Jun | Bucks | present to 5/18 (Gerry Dewaghe) |
| Lesser Black-backed Gull | 1996 | Jan-Mar | Berks | 1 on 11/17 at L. Ontelaunee (Matt Spence) and 1 on 12/15 at Glen Morgan L. (Ken Lebo) |
| Lesser Black-backed Gull | 1996 | Jan-Mar | Bucks | 21 on 12/21 on the So. Bucks CBC and 1 on 12/23-29 at Peace Valley Co. Park (August Mirabella) |
| Lesser Black-backed Gull | 1996 | Oct-Dec | Erie | 1 on 10/18 at Presque Isle SP (Jerry McWilliams) |
| Lesser Black-backed Gull | 1996 | Oct-Dec | Lancaster | present from 10/17 on at Washington Boro (Bob Schutsky) |
| Lesser Black-backed Gull | 1996 | Apr-Jun | Montgomery | 2 on 4/4-20 at Green Lane Res. (Gary Freed) |
| Lesser Black-backed Gull | 1996 | Oct-Dec | Philadelphia | 1 on 9/13 at East Park Reservoir (Robert Ridgely) |
| Lesser Black-backed Gull | 1997 | Jan-Mar | Berks | 1 on 1/30 (Dean Kendall); 2/2 (Matt Spence); and 3/26 (Ken Lebo) all at L. Ontelaunee |
| Lesser Black-backed Gull | 1997 | Jan-Mar | Bucks | Present all quarter at Tullytown |
| Lesser Black-backed Gull | 1997 | Jan-Mar | Lebanon | 1 on 2/1 at SGL 145 (Randy Miller, Ann Mease) |
| Lesser Black-backed Gull | 1997 | Jan-Mar | Erie | Present part of the quarter |
| Lesser Black-backed Gull | 1997 | Jan-Mar | Montgomery | 1 on 2/23-3/14 at Green Lane Res. (George Franchois, Kevin Crilley) |
| Lesser Black-backed Gull | 1997 | Apr-Jun | Bucks | Present up until 5/17 at Tullytown |
| Lesser Black-backed Gull | 1997 | Oct-Dec | Dauphin | 1 on 8/1 at the Susquehanna River (Grace Randolph, Mark McConaughy) |
| Lesser Black-backed Gull | 1998 | Apr-Jun | Montgomery | Present up to 4/7 at Green Lane Reservoir (Kevin Crilley) |
| Lesser Black-backed Gull | 1998 | Apr-Jun | Bucks | Present up to 5/16 at Van Sciver Lake (Gerry Dewaghe) |
| Lesser Black-backed Gull | 1999 | Oct-Dec | Bucks | Present from 9/26 at Peace Valley Park (August Mirabella) |
| Lesser Black-backed Gull | 1999 | Apr-Jun | Bucks | Present up to 5/16 |
| Lesser Black-backed Gull | 1999 | Apr-Jun | Erie | 4 present from 4/2-18 to at Presque Isle SP (Jerry McWilliams) |
| Lesser Black-backed Gull | 1999 | Oct-Dec | Delaware | 1 on 9/9 at the Philadelphia Airport and 1 on 9/17 at Essington (Nick Pulcinella) |
| Lesser Black-backed Gull | 2000 | Jan-Mar | Lebanon | 2 on 11/10 and 1 on 12/20 at Memorial Lake State Park (Randy Miller) |
| Lesser Black-backed Gull | 2000 | Jan-Mar | Berks | Present from 11/4 with a high of 3 on 12/9 at Lake Ontelaunee (Katrina Knight) |
| Lesser Black-backed Gull | 2000 | Jul-Sep | Bucks | Present all quarter |
| Lesser Black-backed Gull | 2000 | Jan-Mar | Montgomery | 1 on 11/23 at Ambler Reservoir (Bill & Naomi Murphy) and 4 on 12/1 at Lansdale (August & Judy Mirabella) |
| Lesser Black-backed Gull | 2000 | Jan-Mar | Philadelphia | 1 on 12/3-25 at Baxter Water Treatment Facility (Kate Somerville) |
| Lesser Black-backed Gull | 2000 | Apr-Jun | Montgomery | 4 present up to 4/2 at Green Lane Reservoir (Kevin Crilley, George Franchois) |
| Lesser Black-backed Gull | 2000 | Apr-Jun | Bucks | Present all quarter |
| Lesser Black-backed Gull | 2000 | Oct-Dec | Northampton | 1 on 9/14 at Martins Creek was early (Rick Wiltraut) |
| Lesser Black-backed Gull | 2000 | Apr-Jun | Berks | 1 on 4/22 at Blue Marsh Lake (Rudy Keller, Harold & Joan Silagy) |
| Lesser Black-backed Gull | 2000 | Apr-Jun | Bucks | Present all quarter |
| Lesser Black-backed Gull | 2001 | Jul-Sep | Erie | 1 on 9/22 at Presque Isle (Ben Coulter) |
| Lesser Black-backed Gull | 2001 | Jul-Sep | Bucks | Peak count of 49 on 9/23 at Peace Valley (August Mirabella) |
| Lesser Black-backed Gull | 2001 | Apr-Jun | Bucks | 25 on 4/14 at Tullytown (Matte Sharp); 2 on 5/19 at Peace Valley Park (August Mirabella) |
| Lesser Black-backed Gull | 2001 | Apr-Jun | Berks | 1 on 4/7 at Lake Ontelaunee (Matt Wlasniewski) |
| Lesser Black-backed Gull | 2001 | Apr-Jun | Lancaster | present 4/15 at Conejohela Flats (Bob Schutsky) |
| Lesser Black-backed Gull | 2001 | Apr-Jun | Montgomery | present up to 4/22 at Green Lane Reservoir (George Franchios) |
| Lesser Black-backed Gull | 2001 | Jul-Sep | Crawford | Immature was found Aug 16 at the Pymatuning Lake Spillway (Robert Leberman) |
| Lesser Black-backed Gull | 2002 | Apr-Jun | Bucks | present through the quarter at Tullytown (m obs) |
| Lesser Black-backed Gull | 2002 | Apr-Jun | Erie | 2 on 4/7 (Dave Wilton) & 1 on 5/6 at Presque Isle State Park (Jerry McWilliams) |
| Lesser Black-backed Gull | 2002 | Aug-Nov | Berks | 1 on 11/1 at Lake Ontelaunee (Matt Wlasniewski) |
| Lesser Black-backed Gull | 2002 | Aug-Nov | Lebanon | 11/10 at Memorial State Park (Randy Miller) |
| Lesser Black-backed Gull | 2002 | Aug-Nov | Montgomery | 1 on 9/7 at Walt Road Green Lane Reservoir (George Franchois) |
| Lesser Black-backed Gull | 2002 | Apr-Jun | Northampton | present on 4/15 (location & observer not listed) |
| Lesser Black-backed Gull | 2002 | Jul | Bucks | Now believed to be present in the county all year at the Penn Warner Club (D. Farbotnik), made first appearances (2) at Lake Nockamixon 7/11 (B Etter) and Peace Valley Park on 7/13 |
| Lesser Black-backed Gull | 2003 | Jun-Jul | Bucks | One was at Peace Valley Park 7/15 (Cameron Rutt) and 3 were at Nockamixon State Park 7/22 (Bill Etter, John Yerger); the first summer scouts to reach the upper county this year |
| Lesser Black-backed Gull | 2003 | Mar-May | Mercer | 1 on 4/8 at Lake Wilhelm (Troyer Family) |
| Lesser Black-backed Gull | 2003 | Jun-Jul | Northampton | Twelve on 6/1 along Mount Pleasant Road (report on PABL) |
| Lesser Black-backed Gull | 2003 | Mar-May | Bucks | widespread with a peak on 4/10 of 72 at Nockamixon State Park and 26 at Lake Towhee Park (Bill Etter) |
| Lesser Black-backed Gull | 2003 | Mar-May | Erie | a total of 7 from 3/11-20 and 4/7 & 21 at Presque Isle State Park (Ben Coulter, Jerry McWilliams) |
| Lesser Black-backed Gull | 2003 | Mar-May | Lancaster | present 4/27 (location and observer not indicated) |
| Lesser Black-backed Gull | 2004 | Jun-Jul | Erie | observed on 7/21 and remained to at least 7/31 on Gull Point at Presque Isle, was a first July record for this species (Jerry McWilliams) |
| Lesser Black-backed Gull | 2004 | Jun-Jul | Northampton | 19 at the Martins Creeks PPL facility along the Delaware River and reported that this is probably the highest count ever for this species in July (Rick Wiltraut). |
| Lesser Black-backed Gull | 2004 | Jun-Jul | Bucks | 17 at the Penn-Warner Tract on 7/11, including two adults (Devich Farbotnik) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Beaver | an adult was on the Ohio River near Merrill's Landing 11/19 (Mark Vass); a third-winter was found at Montgomery Lock and Dam the next day 11/20 (Geoff Malosh) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Montgomery | five were at Church Rd. 11/27 (Kevin Crilley, m. obs.) |
| Lesser Black-backed Gull | 2005 | Jun-Jul | Bucks | unusual for Peace Valley Park in June was a count of 14 on 6/4 (August Mirabella). Other sightings include 5 still at Nockamixon State Park until at least 6/5. 2 on 7/23 and up to 5 there for the rest of July (Bill Etter) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Lancaster | from 9/25 on at Susquehanna River, Conejohela Flats |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Erie | at least five were present around the east end of Presque Isle SP 10/18-11/26 (m. obs.) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Bucks | counts were unusually low until after a cold front 9/18 when 95 and 25 appeared at Peace Valley Park (August Mirabella) and Nockamixon SP (Bill Etter); the next high count wasn't reported until 11/23 when 89 were at Peace Valley Park (Cameron Rutt) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Dauphin | one was noted 11/24 Susquehanna River from Harrisburg (Tom Johnson) |
| Lesser Black-backed Gull | 2005 | Aug-Nov | Lebanon | seven (5 adult and 2 third winter) were found 11/28 at Memorial Lake SP(Tom Johnson) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Delaware | one near the UPS complex at Philadelphia Airport 12/17 (Al Guarente) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Dauphin | two were near the Susquehanna River from Fort Hunter 12/17 (Tom Johnson) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Philadelphia | one on the Pennypack CBC 12/17 from Pleasant Hill Park and one along the Delaware River in the northeast 1/7 (Frank Windfelder) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Lebanon | two adults were reported from Memorial Lake SP 12/1-12/18 (Tom Johnson, Randy Miller) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Berks | up to seven were reported, mostly in late December (m. obs.) |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Bucks | the three CBC total was 263 with 140 of those in the Peace Valley Park area (m. obs.); Large numbers spent January into early Feruary at Peace Valley Park, they moved to Nockamixon SP for the rest of the period |
| Lesser Black-backed Gull | 2005-2006 | Dec-Feb | Montgomery | three at Church Road 2/1 (George Franchois) |
| Lesser Black-backed Gull | 2006 | Jun-Jul | Bucks | A count of 11 consisted of 9 first-summer 1 second-summer and 1 third-summer at Tullytown Landfill 7/20 (CR) and 1 to 3 lingered into the first week of June at Nockamixon S.P. |
| Lesser Black-backed Gull | 2006 | Jun-Jul | Erie | One at Gull Point 6/9 (Jerry McWilliams PABIRDS Listserve). |
| Lesser Black-backed Gull | 2006 | Dec-Feb | Erie | at least 20 at Presque Isle SP during the period (m. obs.) |
| Lesser Black-backed Gull | 2006 | Mar-May | Montgomery | 6 at Green Lane Reservoir 3/19 (George Franchois) |
| Lesser Black-backed Gull | 2006 | Mar-May | Northampton | 2 at Martins Creek quarry 5/13 (Michael Schall). |
| Lesser Black-backed Gull | 2006 | Mar-May | Berks | 2 last reported at L. Ontelaunee 3/5 (Rudy Keller) |
| Lesser Black-backed Gull | 2006 | Mar-May | Bucks | 350 at Nockamixon S.P. 3/16 (Bill Etter); a new local single site high count. Small numbers lingered at Peace Valley Park (August Mirabella) and Nockamixon S.P. (Bill Etter) through May |
| Lesser Black-backed Gull | 2006 | Mar-May | Erie | up to 10 from 3/21 - 5/26 in the surrounding waters of Presque Isle S.P. (m.ob.) |
| Lesser Black-backed Gull | 2007 | Jun-Jul | Bucks | About 6 1st- and 2nd-year birds noted at Tullytown through the season (Thomas Johnson Devich Farbotnik Carla Veltrup) one at Peace Valley Park 7/21 (listserv) |
| Lesser Black-backed Gull | 2007 | Jun-Jul | Lancaster | Adult on Conejohela Flats could be the first summer record of an adult in Pennsylvania (Tom Johnson listserv). |
| Lesser Black-backed Gull | 2008 | Jun-Jul | Bucks | A few were at Penn Warner Tract in Jun, probably remained all season. |
| Lesser Black-backed Gull | 2009 | Mar-May | Bucks | 431 at Nockamixon State Park 3/23 (August Mirabella), 50 at Peace Valley Park 3/23 (August Mirabella) |
| Lesser Black-backed Gull | 2009 | Mar-May | Crawford | one at the Pymatuning Spillway 4/14 (Scott Kinzey) |
| Lesser Black-backed Gull | 2009 | Mar-May | Erie | 2 at the Lakeview Landfill 3/10 (Jerry McWilliams) |
| Lesser Black-backed Gull | 2009 | Mar-May | Delaware | one at Little Tinicum Island 3/30 (Al Guarente) |
| Lesser Black-backed Gull | 2009 | Mar-May | Philadelphia | one from the winter was last seen at Rhawn Street at the Delaware River 3/13 (Frank Windfelder). |
| Lesser Black-backed Gull | 2009 | Mar-May | Lancaster | one at the "Rocks" 5/29 (Jonathan Heller) |
| Lesser Black-backed Gull | 2011 | Jun-Jul | Bucks | three in the Falls Twp. area 6/19 (Matt Sabatine). |
| Lesser Black-backed Gull | 2012 | Mar-May | Luzerne | See County report |
| Lesser Black-backed Gull | 2012 | Mar-May | Bucks | See County report |
| Lesser Black-backed Gull | 2012 | Mar-May | Crawford | See County report |
| Lesser Black-backed Gull | 2012 | Mar-May | Erie | See County report |
| Lesser Black-backed Gull | 2012 | Mar-May | Mercer | See County report |
| Lesser Black-backed Gull | 2012 | Mar-May | Northampton | See County report |
| Lesser Black-backed Gull | 2012 | Jun-Jul | Delaware | 3 along Delaware River 7/20 (Al Guarente) |
| Lesser Black-backed Gull | 2012 | Mar-May | Somerset | See County report |
| Lesser Black-backed Gull | 2012 | Jun-Jul | Bucks | at Peace Valley Park starting 6/24 (August Mirabella) increased to 3 on 7/22 (Kurt Schwarz), and 3 at Morrisville Levee on 7/3 (Bill Keim) |
| Lesser Black-backed Gull | 2012 | Jun-Jul | Philadelphia | at Pennypack on the Delaware 7/22 (Frank Windfelder). |
| Lesser Black-backed Gull | 2013 | Mar-May | Berks | last seen at Blue Marsh Lake 3/17 (Rudy Keller) |
| Lesser Black-backed Gull | 2013 | Mar-May | Bucks | high count for the season if 486 at Nockamixon State Park 3/25 (Devich Farbotnik) was probably a new single-site Bucks record as well, and other reports were made through 5/17 |
| Lesser Black-backed Gull | 2013 | Jun-Jul | Philadelphia | one at Pennypack on Delaware 7/28 (Frank Windfelder, eBird). |
| Lesser Black-backed Gull | 2013 | Mar-May | Chester | one in Unionville 3/11 (Kelley Nunn) |
| Lesser Black-backed Gull | 2013 | Mar-May | Erie | up to 25 reported during the season at Presque Isle State Park, last 5/7 (m.ob.) |
| Lesser Black-backed Gull | 2013 | Mar-May | Lancaster | three sightings on the Susquehanna River 3/10-24 (Mike Epler, Gordon Dimmig) |
| Lesser Black-backed Gull | 2013 | Mar-May | Lehigh | 60 at Lehigh Canal Park 3/24 was the high count for the season (Mark Boyd), last seen 3/31 at Dorney Pond (Ed Komito) |
| Lesser Black-backed Gull | 2013 | Mar-May | Northampton | two reports at Nazareth Quarry in Apr were last |
| Lesser Black-backed Gull | 2013 | Mar-May | Philadelphia | last was one at Pennypack on the Delaware 5/26 (George Armistead). |
| Lesser Black-backed Gull | 2013 | Mar-May | Montgomery | present through 4/7 (Stephen Kacir), season high was 38 at Green Lane Pond 3/11 (George Franchois) |
| Lesser Black-backed Gull | 2014 | Jun-Jul | Erie | one second-year bird at Gull Point 7/5 (m.ob., eBird). |
| Lesser Black-backed Gull | 2016 | Mar-May | Allegheny | one continued in Pittsburgh from last season up to 3/7 (Patience Fisher) |
| Lesser Black-backed Gull | 2016 | Mar-May | Bucks | 80 at Peace Valley Park 3/2 (Scott Godshall), 64 there 4/3 (August Mirabella), one at Nockamixon State Park 5/1 (Paul Cooper), one at the Penn-Warner Tract 5/14 (Devich Farbotnik) |
| Lesser Black-backed Gull | 2016 | Mar-May | Crawford | one at the Pymatuning Causeway 3/5 (Randy Stringer) |
| Lesser Black-backed Gull | 2016 | Mar-May | Erie | several reported at Presque Isle Bay and the Lake View Landfill 3/2-5/6 (Randy Stringer, Jerry McWilliams, Julie Dell, David Sibley) |
| Lesser Black-backed Gull | 2016 | Mar-May | Lehigh | last of the season at Dorney Pond 4/13 (Rich Rehrig) |
| Lesser Black-backed Gull | 2016 | Mar-May | Philadelphia | four on the Delaware River 3/27 (Tony Croasdale). |
| Lesser Black-backed Gull | 2017 | Mar-May | Chester | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Lycoming | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Susquehanna | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Montgomery | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Erie | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Lancaster | See Local Notes |
| Lesser Black-backed Gull | 2017 | Mar-May | Bucks | See Local Notes |
| Lesser Black-backed Gull | 2018 | Jun-Jul | Bucks | 2 at Morrisville Levee 7/31 (August Mirabella) and one sub-adult at Nockamixon SP-Marina 7/23 (Bill Etter). |
| Lesser Black-backed Gull | 2019 | Mar-May | Lehigh | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Mercer | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Berks | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Bucks | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Centre | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Crawford | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Erie | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Lancaster | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Montgomery | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Northampton | See Local Notes |
| Lesser Black-backed Gull | 2019 | Mar-May | Susquehanna | See Local Notes |
| Lesser Black-backed Gull | 2020 | Mar-May | Mercer | present at Maurice Goddard SP 3/4 (Michael Williams) with a high count of five there 3/24 (Jim McConnor, Michael Williams). |
| Lesser Black-backed Gull | 2020 | Mar-May | Allegheny | one at Emsworth Dam 5/5 (Paul Brown) |
| Lesser Black-backed Gull | 2020 | Mar-May | Bucks | high counts at Nockamixon SP include 461 on 3/14 (August Mirabella) and 410 on 4/11 (Kenneth Rieker) |
| Lesser Black-backed Gull | 2020 | Mar-May | Crawford | one at Pymatuning Lake Dam 3/3 (Michael Williams), two there 3/7 (Thomas Nonnenmacher, Ken Pinnow, Michael Williams) |
| Lesser Black-backed Gull | 2020 | Mar-May | Delaware | present at Fort Mifflin 3/28 (Jim McConnell), 3/29 (Zach Millen, Brian Quindlen) and 4/12 (Damon Orsetti) and one at Commodore Barry Bridge/Riverfront 4/13 (Rob Fergus) |
| Lesser Black-backed Gull | 2020 | Mar-May | Lancaster | two at Middle Creek WMA 3/23 (Bruce Carl), two at Conejohela Flats 4/30 (Rebecca Millen, Zach Millen, Ted Nichols) |
| Lesser Black-backed Gull | 2020 | Mar-May | Lebanon | one on Mt. Pleasant Road 5/23-24 (Jonathan Heller, Timothy Becker, Kathy Becker, Steve Walthius, Brian Brown, Justin Felty, Jonathan DeBalko) |
| Lesser Black-backed Gull | 2020 | Mar-May | Lehigh | one at Dorney Pond daily through 4/10 |
| Lesser Black-backed Gull | 2020 | Mar-May | Erie | up to four at Presque Isle SP first week of March (Jerry McWilliams) |
| Lesser Black-backed Gull | 2020 | Jun-Jul | Bucks | one to three at Nockamixon SP through much of June (Bill Etter, Paul Heveran, August Mirabella) and one at Penn-Warner Tract 6/8 (Andrew Harrington) |
| Lesser Black-backed Gull | 2020 | Jun-Jul | Lancaster | adult on Conejohela Flats 7/23 (Jason Horn, ph.). |
| Lesser Black-backed Gull | 2021 | Jun-Jul | Bucks | one injured adult stayed at Nockamixon SP until at least 7/17 (m.ob. ph.) |
| Lesser Black-backed Gull | 2021 | Jun-Jul | Erie | on 730 at Gull Point (Jerry McWilliams). |
| Lesser Black-backed Gull | 2022 | Jun-Jul | Bucks | one at Peace Valley Park 7/28 (Edward Dolan) |
| Lesser Black-backed Gull | 2022 | Jun-Jul | Erie | adult was photographed at Gull Point 6/17 (Jim Donn). |
| Lesser Black-backed Gull | 2023 | Mar-May | Berks | one in Oley 3/4 (Rudy Keller), one at Lake Ontelaunee 3/8 (Rudy Keller) |
| Lesser Black-backed Gull | 2023 | Mar-May | Bucks | 1042 at Nockamixon State Park Marina 3/4 (Devich Farbotnik), 1130 were there 3/11 (Eric Zawatski) |
| Lesser Black-backed Gull | 2023 | Mar-May | Chester | one at Mosquito Lane Retention Pond 3/10 (Derek Stoner) |
| Lesser Black-backed Gull | 2023 | Mar-May | Delaware | present at Marcus Hook from mid-March to mid-April, five at the Commodore Barry Bridge 4/30 (Debbie Beer), also along Hog Island Road 3/25 (m.ob.) and 4/15 (Rob Fergus) |
| Lesser Black-backed Gull | 2023 | Mar-May | Lebanon | one in the Lebanon area 3/25 (Rita Stima) |
| Lesser Black-backed Gull | 2023 | Mar-May | Montgomery | 25-40 at Green Lane Park through 3/11 (m.ob.) with decreasing numbers remaining through 3/26 (m.ob.) |
| Lesser Black-backed Gull | 2023 | Mar-May | Pike | present at Lake Wallenpaupack 3/12-4/9 with a high count of 10 on 3/15 (Ryan Johnson) |
| Lesser Black-backed Gull | 2023 | Mar-May | Wayne | one at Lake Wallenpaupack 3/12 (Chris Fischer, Bradley White) |
| Lesser Black-backed Gull | 2023 | Mar-May | Philadelphia | one at Bartram's Garden 3/21 (Angelo Dellomargio), up to two at the Philadelphia Naval Yard 3/7-4/5 (m.ob.), six at Hog Island 3/25-4/15 (Rob Fergus). |
| Lesser Black-backed Gull | 2024 | Jun-Jul | Bucks | three at Nockamixon SP 7/14 (David Smith, eBird), one at Penn Warner Tract 7/30 (Eric Zawatski, eBird), and a high count of seven on the Delaware R in Morrisville 7/31 (Mark Gallagher). |