Two-headedness happens from the failed separation of monozygotic twins (the same misstep in the process that makes conjoined twins). Each head typically has its own brain that can both control its shared limbs.
Cat
This cat is treated like two cats by its owner. Named Frank and Louie, it kind of personifies a two-creature, one side looks Puss in Boots cute while the other seems sneaky and sinister. Image: AP
Pig
Pigs can have two heads too! Though it doesn’t mean more belly, it does have an aw, shucks cuteness to it, doesn’t it?
Dog
Two-headed dogs can happen naturally but mad Soviet scientist Vladimir Demikhov actually performed dog-head transplants on man’s best friend through surgery.
Cow
Cyclops cow is very scary looking. Image: AP
Bird
Found by April Britt in Massachusetts, this bird is a baby cardinal with two heads and three beaks. It’s unlikely that the two-headed bird would live long in the wild because animals with abnormalities usually fare poorly in the ruthless world. Image: April Britt via the Daily Hampshire Gazette
Crocodile
This two-headed scaly beast has heads on opposite sides of each other. Found in 2001 in Thailand on a crocodile farm, the crocs are more Siamese twins than polycephalic. Either way, they still have two heads and though two-headed reptiles are more common than mammals (polycephalic reptiles don’t even look that weird to me), these crocs are just insane.
Trout
This two-headed brown trout is either a result of nature’s cruel randomness or a mutation caused by a big corporation who could give a crap about the environment.
Cockroach
AGHHHHHHH!!!!!!























That dog one is pretty horrific
Agreed. That one really disgusted me. I feel sick in the stomach watching that, and knowing that was a human who did that to two poor dogs. Animal cruelty.
I don't think it's sad to have two faces
I agree...you might want to put some sort of warning on the dog one. I'd seen it before, but wont be watching it again..
"Who could give a crap about the environment."
Ugh.