10 Worst Evolutionary Designs

FUCK THE POLICE

911 EVERY DAY
http://www.wired.com/science/discoveries/magazine/17-08/st_best

10 Worst Evolutionary Designs
By David Wolman

1 Sea mammal blowhole. Any animal that spends appreciable time in the ocean should be able to extract oxygen from water via gills. Enlarging the lungs and moving a nostril to the back of the head is a poor work-around.

2 Hyena clitoris. When engorged, this "pseudopenis," which doubles as the birth canal, becomes so hard it can crush babies to death during exit.

3 Kangaroo teat. In order to nurse, the just-born joey, a frail and squishy jellybean, must clamber up Mom's torso and into her pouch for a nipple.

4 Giraffe birth canal. Mama giraffes stand up while giving birth, so baby's entry into the world is a 5-foot drop. Wheeee! Crack.

5 Goliath bird-eating spider exoskeleton. This giant spider can climb trees to hunt very mobile prey. Yet it has a shell so fragile it practically explodes when it falls? Well, at least it can produce silk to make a sail. Oh, wait — it can't!

6 Shark-fetus teeth. A few shark species have live births (instead of laying eggs). The Jaws juniors grow teeth in the womb. The first sibling or two to mature sometimes eat their siblings in utero. Mmm ... siblings.

7 Human stomach. People can digest a lot — except for cellulose, the primary component of plant matter. Why don't we have commensal bacteria in our guts to do it? They're busy helping termites.

8 Slug genitalia. Some hermaphroditic species breed by wrapping their sex organs around each other. If one of said members gets stuck, the slug simply chews it off. What. The. Hell?

9 Quadrupeds. Let's say you're a four-footed animal. Now let's say you get a wound on your back, or an itch, or a bug wandering up there. Tough luck, kid. You probably can't do much about it. Hope there's a low branch around.

10 Narwhal tusk. The unicorn-like protuberance on a male narwhal's head is actually a tooth that erupts through the front of the jaw and keeps on growing, up to 9 feet. Narwhal: "Doc, I have a toothache." Dentist: "Indeed."
 
7 Human stomach. People can digest a lot — except for cellulose, the primary component of plant matter. Why don't we have commensal bacteria in our guts to do it? They're busy helping termites.

uhhh, it's called "fiber"....when you get older they make you eat more of it, it's actually quite good for you.....
 
How about having testicles on the outside of the body? Who's idea was that? It could be used to argue that there is no God.

Women got weaker upper bodies, childbirth and mentrual cycles. Putting the testicles outside the body just made the target easier. They deserved a break.


Of course they did get multiple orgasms, which could be worth the other negatives.
 
Cellulose has energy in it the body just ignores. It doesn't matter if it's good for you or not; it would make more sense for it to be both good for you and digestible.

dude, if it was digestible it wouldn't be able to do what it's good at.....it's what keeps you from having diarrhea 24/7........it's the straw in your brick....
 
Anyone for a biology lesson? LOL

External testicles only exist in boreoeutherian land mammals. There are several hypotheses for how they developed external testicles. The first is that spermatogenisis occurs optimally at a temperature range slightly lower then core body temperature and that external testicles are more efficient at temperature regulation then internal testicles. There are several problems with that hypothesis though.

Another hypothesis is that they evolved as an irreversable adaptation to sperm competition. It's been suggested the the progenitor to boreoeurtherian mammals developed external testicles as the required larger testicles for sperm competition. Several problems with that hypothesis too.

Another plausable hypothesis is that that external testicles, like human females permanently swollen breast, serve as sexual signal for male sexual health and fertility.
 
Anyone for a biology lesson? LOL

External testicles only exist in boreoeutherian land mammals. There are several hypotheses for how they developed external testicles. The first is that spermatogenisis occurs optimally at a temperature range slightly lower then core body temperature and that external testicles are more efficient at temperature regulation then internal testicles. There are several problems with that hypothesis though.

Another hypothesis is that they evolved as an irreversable adaptation to sperm competition. It's been suggested the the progenitor to boreoeurtherian mammals developed external testicles as the required larger testicles for sperm competition. Several problems with that hypothesis too.

Another plausable hypothesis is that that external testicles, like human females permanently swollen breast, serve as sexual signal for male sexual health and fertility.

I am going to play the conservative on this issue and ignore your facts. I like my explanation better.
 
dude, if it was digestible it wouldn't be able to do what it's good at.....it's what keeps you from having diarrhea 24/7........it's the straw in your brick....

I'm using "digestible" here to mean "able to get energy from". The body just ignores the energy in it. I'm not sure if cellulose = fiber exactly anyway.
 
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