Sunday, August 14, 2011
CONJOINED ANIMAL TWINS
Anyway, the same thing that happens to people sometimes happens to animals, and the result is conjoined twin animals. Except that we don't hear about it as much because (1) conjoined animals might not even be able to get out of their mom and be born, or (2) they might get born, but they are born dead, or (3) if they are born alive, they usually can't survive for very long, especially not in the wild.
No one is totally sure how conjoined twins happen, but there are two theories. The older theory is that the egg gets fertilized in the womb, and then it splits in two, but it doesn't split completely. This theory is called fission. The newer theory that people now think is more correct is that the fertilized egg splits completely, but then the stem cells in the twins start looking for similar stem cells (because this is what stem cells do), and they end up growing parts of the twins back together. The name of this theory is fusion.
Okay, so that's enough explanatory stuff. Now we need to look at some pictures. I tried very hard to find photos that are real, true photos and not ones that are photoshopped, but it's difficult to tell the difference sometimes, so I'm sorry if I got fooled.
Here are a couple of examples of snakes with two heads:
The rest of the examples I found are mostly of animals with extra legs, which is a condition that I think would make it hard to walk very well, unless you were really well coordinated.