Swallow-tailed seagull and Marine iguana perched on rocks, Galapagos Islands, Ecuador

Swallow-tailed gull perched rocks, Galapagos Islands, Ecuador

Carrion Crow (Corvus corone corone) in flight dropping Mussel (Mytilus edulis) onto ground to break it up and to feed. Angus, Scotland, UK

Carrion Crow (Corvus corone corone) in flight dropping Mussel (Mytilus edulis) onto ground to break it up and to feed. Angus, Scotland, UK

Bearded vulture, lammergeier or ossifrage (Gypaetus barbatus) perched in Giant's Castle Game Reserve, Drakensberg, South Africa. Rare scavenger with striking plumage, known for bone-dropping behaviour.

Common Kingfisher defecating, Denmark

Grey Heron defecating in a meadow, France