No reason.  I just think this is neat.  Enjoy.
Swallowtail Caterpillars
Primates Rumps
Stalk-eyed fly
Wear a brain diaper for this:
Hooded Seal
*** You must see this to believe it. Unreal. Surreal. Really real.
ARKive - Hooded seal video - Cystophora cristata - 12
Frigate bird
Tragopan bird
Greater Sage Grouse
Frogs
Puffer fishes
Ticks
Swell shark
Longer, awesomer, David Attenborougher, also pit viper:
http://www.youtube.com/watch?v=Qy67XU6xEi8
Owls
 
Penises
 
Images from here, here, here, here, here, here, here, here, here, here, here, here, here, here, here and here.
Swallowtail Caterpillars
- Purpose - defense. They're stinky.
 
Primates Rumps
- Purpose - it's sexy...apparently. And, it lets the guys know you're ready for some lovin'.
 - Thank the stars that we evolved away from this. Can you imagine all the 'lip stick' and implants some women would get? I shudder at the thought...
 
| Bonobos | 
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| black crested macaque | 
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| hamadryas baboon | 
- Purpose - to show off to the ladies.
 
Hooded Seal
- Purpose - sexiness
 
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| Don't even try to figure it out. It's the inside of one of his nostrils. | 
*** You must see this to believe it. Unreal. Surreal. Really real.
ARKive - Hooded seal video - Cystophora cristata - 12
Frigate bird
- Purpose - sexiness
 
Tragopan bird
- Purpose -what else? Sexiness
 
Greater Sage Grouse
- Purpose - sexiness.
 
Frogs
- Purpose - resonate croaks for...what else? Sexiness
 
Puffer fishes
- Purpose - be too big and spiky to eat.
 
Ticks
- Purpose - gorge
 
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| This is so disgusting I have vivid memories from watching it years ago: | 
Swell shark
- Purpose - become a mouthful.
 
- Purpose - they're hungry
 
Longer, awesomer, David Attenborougher, also pit viper:
http://www.youtube.com/watch?v=Qy67XU6xEi8
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| Even gators like to wear snake skin | 
Owls
- Purpose - camo and to look intimidating
 
Penises
- Purpose - internal fertilization
 
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| 17 inches | 
Images from here, here, here, here, here, here, here, here, here, here, here, here, here, here, here and here.



























































