Francisco Piedrahita:
Gaviota Reidora, Laughing Gull (Larus atricilla)
Francisco Piedrahita:
Gaviota Reidora, Laughing Gull (Larus atricilla)
Francisco Piedrahita:
Gaviota Tijereta, Swallow-tailed Gull (Creagrus furcatus)
Francisco Piedrahita:
Gaviota Tijereta, Swallow-tailed Gull (Creagrus furcatus)
Francisco Piedrahita:
Gaviota Andina, Andean Gull (Larus serranus) (Chroicocephalus serranus)
Francisco Piedrahita:
Gaviota Cabecigrís, Gray-hooded Gull, Grey-headed Gull (Chroicocephalus cirrocephalus) (Larus cirrocephalus)
Francisco Piedrahita:
Gaviota Cabecigrís, Gray-hooded Gull, Grey-headed Gull (Chroicocephalus cirrocephalus) (Larus cirrocephalus)
Francisco Piedrahita:
Brown-hooded Gull (Larus maculipennis)
Francisco Piedrahita:
Brown-hooded Gull (Larus maculipennis)
Francisco Piedrahita:
Gaviota de Franklin, Franflin's Gull (Larus pipixcan) (Leucophaeus pipixcan)
Francisco Piedrahita:
Gaviota de Delaware, Ring-billed Gull (Larus delawarensis)
Francisco Piedrahita:
Gaviota de Delaware, Ring-billed Gull (Larus delawarensis)
Francisco Piedrahita:
Gaviota de Delaware, Ring-billed Gull (Larus delawarensis)
Francisco Piedrahita:
Hartlaub's Gull (Larus hartlaubii)
Francisco Piedrahita:
Gaviota Argéntea, Herring Gull (Larus argentatus)
Francisco Piedrahita:
Silver Gull (Larus novaehollandiae)
Francisco Piedrahita:
Gaviota de Belcher, Belcher's Gull (Larus belcheri)
Francisco Piedrahita:
Gaviota de Belcher, Belcher's Gull (Larus belcheri)
Francisco Piedrahita:
Great Black-backed Gull (Larus marinus)
Francisco Piedrahita:
Gaviota Atlántica, Great Black-backed Gull (Larus marinus)
Francisco Piedrahita:
Great Black-backed Gull (Larus marinus)
Francisco Piedrahita:
Great Black-backed Gull (Larus marinus)
Francisco Piedrahita:
Pacific Gull (Larus pacificus)
Francisco Piedrahita:
Pacific Gull (Larus pacificus)
Francisco Piedrahita:
Lesser Black-backed Gull (Larus fuscus)
Francisco Piedrahita:
Lesser Black-backed Gull, Baltic Gull (Larus fuscus) (Larus fuscus fuscus)
Francisco Piedrahita:
Lesser Black-backed Gull, Baltic Gull (Larus fuscus) (Larus fuscus fuscus)
Francisco Piedrahita:
Lesser Black-backed Gull (Larus fuscus)
Francisco Piedrahita:
Western Gull (Larus occidentalis)
Francisco Piedrahita:
Western Gull (Larus occidentalis)
