Black Skimmer, Nickerson BeachBlack Skimmer, Nickerson BeachBlack Skimmer, Nickerson BeachIceland Gull, Conowingo Dam, MarylandWestern Gull, La Jolla, CaliforniaGlaucous-winged Gull (Larus glaucescens)Glaucous-winged Gull (Larus glaucescens)California Gull, La Jolla Cove, CaliforniaRing-billed Gull, Washington DCRing-billed Gull, Washington DCRing-billed Gull, Washington DCHeermann's Gull (Larus heermanni)Heermann's Gull (Larus heermanni)Heermann's Gull (Larus heermanni)Heermann's Gull (Larus heermanni)Bonaparte's Gull, Washington DCBonaparte's Gull, Washington DCBonaparte's Gull, Washington DCCommon Tern, Nickerson BeachCommon Tern, Nickerson Beach