What are four things that have 2 legs?

All cats and dogs have four legs, and also dingos, foxes, wolves, coyotes, tigers, lions, and hyenas, rhinos, hippos, gators, crocs, and a lot of adult amphibians (like frogs) and reptiles, with the exception of snakes. That pretty much covers it, besides the rodents, who have 4 legs too, which include rats, field mice, squirrels, chipmunks, and the largest rodents, capybaras.

this is not all however!

my answer was partially taken from the question "what animals have four legs?"