This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
BirdSkulls PZSL. Alca impennis Pinguinus impennis Linnaeus Pontoppidan Linnaeus Gmelin Temminck Latham Linnaeus Gould Skulls of schizorhinal birds Great Auk from ventral Herring Gull from dorsal Eurasian Curlew from dorsal Rock Dove from dorsal Combcrested Jacana or Bronzewinged Jacana from dorsal Dovekie from dorsal Plainswanderer