sentences: a leg birds is a mean of magnifying plastic
docs: feather_on_bird is tangible_thing. birdsong is animal_noise. birds has two_legs red_footed_booby is bird. pink_footed_goose is bird. pygmy_goose is bird. vermilion_flycatcher is bird. pygmy_falcon is bird. birds has eyes birds has feathers_and_can_usually_fly