I was thinking about the Kakapo (a flightless parrot) today like we all do from time to time and it reminded me about all the leftovers from evolution and how confusing they can be for some people to understand how or why they came about.
How come a bird lost the ability to fly?
How could that benifit it in terms or evolution?
Well the Kakapo found itself on an island without predators, so rather than eat a little bit then fly away to a perch the Kakapo really tucked in to a meal knowing it wasn't in any danger of having to fly away at the spur of the moment. The birds that ate more couldn't fly but had more energy and were naturally selected for.
Our bodies have several, here are a few :
- The Appendix a sac that other animals have which helps them handle a really high plant diet.
- Goose Bumps which used to be used for raising hair follacles, ever make a cat mad or watch a bird in the sun?
- Wisdom Teeth were used for mashing up lots of veggies.
None of these things are essential for living and can be removed without slowing you down at all.
What you need to remember is that there is no pressure against these vestigal features forcing them to disappear.
For example goose bumps certainly don't help us in anyway but more importantly they don't hurt us in any way.
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