The most frightening mutant animals in the world are: long-horned caterpillar, two-billed fish, conjoined crocodile, hexapod octopus, one-eyed shark, four-legged duck and so on.

1, long-horned caterpillar

The first one to make the list of the world's horrible mutant animals is the long-horned caterpillar, which is common in life, but this caterpillar has several horns and looks weird and special.

2. Two-billed fish

Fish is a favorite food for many people, but I believe there is no more desire to see this fish. Two-billed fish comes from the United States. As the name suggests, it is a fish with two mouths, which is mainly caused by genetic variation.

3, conjoined crocodile

When it comes to siamese crocodiles, many people may think of the strangest siamese in the world. This special crocodile comes from Bangkok, Thailand. Their bottoms are connected together, and one has eight legs and two tails.

4, hexapod octopus

Generally, octopus has eight legs, but this particular hexapod octopus may be caused by reproductive defects, mainly related to the environment.

5. One-eyed shark

The one-eyed shark, which is rare in the United States, is also on the list of the strangest animals in the world. This strange shark was found off the coast of Britain, and some experts think it may be caused by environmental pollution.

6. Four-legged duck

The four-legged duck was born in 2007. It was born with four legs. It looks quite strange, but its daily development has not been greatly affected, probably because of genetic variation.