Two heads aren’t always better than one.
Two-headed reptiles have a very hard time feeding themselves. This bearded dragon isn’t as fast as a normal dragon. It also appears that only one head is eating, which is pretty normal for animals with this deformity.
Two-headed snakes, turtles, and lizards are the result or the same process that forms conjoined twins. Indeed, it is best to think of this lizard as a conjoined twin of two different individuals.
Conjoined twin reptiles seem to do better than mammals, though.
The reptile house I worked for had a still-born conjoined carpet python. It appeared to be completely developed and just wasn’t able to hatch:
http://www.flickr.com/photos/cyborgsuzy/153271301/
how do you get a conjoined twin bearded dragon? What happens inside the egg?
When the zygote cells split, they don’t split all the way.
Same as conjoined twins with humans.
ok thanks for the info, ive got a beardie with 5 legs but not 2 heads, i found him at a rescue i would really like to see one with 2 heads in real life.
Dont that happen when siblings breed too? Im just curious.