1) Animals with two legs 2) Birds 3) Birds and people 4) Chicks and ducks and geese 5) Creatures with two feet 6) Hens and roosters 7) Human beings 8) Humans 9) Humans and apes 10) Humans and birds 11) Humans and herons 12) Humans and ostriches 13) Humans and other two-footers 14) Humans, among others 1) Men