Lifted from PopBitch....
"The Deep Sea Angler fish lives thousands of
feet below the surface of the ocean where there
is little food or light. Life is hard and lonely
for the young male angler fish as it slowly sinks
from the surface where it grew up. At about a
thousand metres down, it metamorphoses. It
gets big teeth, big eyes, and loses its
digestive tract.
In this state, it has only one chance of
survival: having sex. In the distance, he spies
a dim light. He is in luck, it is a single
"unattached" female! The male, who is only a
fraction of her size, grabs hold of her with
his teeth. Over time, his skin and blood vessels
start to fuse with hers. His skin gets tougher,
his eyes start shrinking, and any unnecessary
organ wastes away. He is now totally reliant
on her and in fact, is part of her. The male
has become simply a source of sperm
http://www.geocities.com/thesciencefiles/angler/fish.html