The gaping corollas of various blossoms have suggested such names as dog's-mouth, rabbit's-mouth, and lion's-snap, and plants with peculiarly-shaped leaves have given rise to names like these--mouse-ear (_Stachys Zanaia_), cat's-ears, and bear's-ears.

Numerous names have been suggested by their fancied resemblance to the feet, hoofs, and tails of animals and birds; as, for instance, colt's-foot, crow-foot, bird's-foot trefoil, horse-shoe vetch, bull-foot, and the vervain, nicknamed frog's-foot.

Then there is the larkspur, also termed lark's-claw, and lark's-heel, the lamb's-toe being so called from its downy heads of flowers, and the horse-hoof from the shape of the leaf.

Among various similar names may be noticed the crane's-bill and stork's-bill, from their long beak-like seed-vessels, and the valerian, popularly designated capon's-tail, from its spreading flowers.
Many plant names have animal prefixes, these indeed forming a very extensive list.

But in some instances, "the name of an animal prefixed has a totally different signification, denoting size, coarseness, and frequently worthlessness or spuriousness." Thus the horse-parsley was so called from its coarseness as compared with smallage or celery, and the horse-mushroom from its size in distinction to a species more commonly eaten.