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Biology

What are vestigial organs?

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April 19, 2015 9:29AM

A vestigial trait (i.e. organ, appendage, etc) is a remnant part of an organism that historically was very important but evolutionarily is no longer needed. For example, the tailbone on humans is considered vestigial because it serves little to no purpose, although at one point it most likely connected to a tail.

Another example is the dew claw on a dog (the small, dangling claw on a dog's front paws). Clearly there's no use for it today, but at one point it may have served an important purpose for survival.

appendix

wisdom teeth

tailbone

male nipples xD

body hair

thymus gland

the "tip" of your ear

ear muscles