Male Great frigatebird (Fregata minor) trying to steal nesting material from a red-footed booby, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult Adelie Penguin (Pygoscelis adeliae) stealing rocks for a nest near the Antarctic Peninsula.

Adult Adelie penguin (Pygoscelis adeliae) stealing a rock from a neighbors nest on breeding colony on Petermann Island, Antarctica

Adult Adelie Penguin (Pygoscelis adeliae) stealing rocks for a nest near the Antarctic Peninsula.

Adult Adelie Penguin (Pygoscelis adeliae) stealing rocks for a nest near the Antarctic Peninsula.

Adult Adelie Penguin (Pygoscelis adeliae) stealing rocks for a nest near the Antarctic Peninsula.