swallow-tailed gull creagrus furcatus - egg shell

animal animals avian beak bill biology bird birding birds charles color creagrus darwin ecuador endemic espanola fauna feather furcatus galapagos galaiexcl pagos genovesa gull island islands mate mating national natural nature ocean ornithology outdoor outdoors pair park pretty province remote sea seabird seagull swallow tailed travel unique wild wildlife zoology