Tripods might be popular in science fiction, but there are no truly three-limbed animals, living or extinct, on Earth. Tracy Thomson has been thinking about why that may be, and the value of considering what evolution cannot do.
Tripods might be popular in science fiction, but there are no truly three-limbed animals, living or extinct, on Earth. Tracy Thomson has been thinking about why that may be, and the value of considering what evolution cannot do.