flightless birds collection silhouette on white background. ostrich, emu, kiwi, penguin and cassowary

africa animal antarctic australia beak big bill bird birds cassowary casuarius chick crest design ecology egg emperor emu endemic exotic fast fauna feather flightless fowl herbivore illustration kiwi nature new ornithology ostrich peck penguin plumage polar poster rare runner safari shirt silhouette southern unusual vector wildlife wing zealand zoo zoology