Animals have strange shapes

For many different reasons, there are animals that are born with strange shapes such as six-legged calves, three-horned cows, two-headed snakes or three-eyed fish.

An adult cat has an average weight of 3-5kg.But in 2012, this 2-year-old cat weighs up to 17kg.(Photo: AP)

Two-headed turtle at San Antonio Zoo, USA.They have a close body, and are named Thelma and Louise.(Photo: AP)

A 6-legged calf, with "legs" on its back in Weissenburg, Switzerland.The calf was born in February 2012 and named Lilli.(Photo: AP)

Three-eye fish in Argentina.(Photo: Gizmodo)

Two muzzle pigs were born on a farm in Jilin Province, northern China.The pig is named Xiaobao.(Photo: Europics CEN)

A two-headed snake at the World Aquarium Animal Exhibition Center, St. PetersburgLouis, USA.The snake is named Us and is 1.2m long.(Photo taken in 2011)

Previously, a two-headed snake had lived here for 8 years and 6 months, before dying in June 2007.In 2006, experts tried to mate with another two-headed snake but failed.(Photo: AP)

Tiny turtle two heads of Teeny and Tiny by Todd Ray, program director of Venice Beach Freakshow, Los Angeles state, USA.(Photo: Venice Beach Freakshow)

When the cow was born, this cow in Hebei Province in China only had a small bump on its forehead.However, over time, the swelling has grown, longer and sharper, making the cow have three horns.(Photo: Mirror)

The two-headed cow is nurtured by farmers in a village near Alexandria, Egypt.This cow cannot stand on its own feet because the head is too heavy.(Photo: AP)

Two conjoined swallow birds were found in Searcy, Arkansas, USA, 2008. (Photo: National Geographic)

Two-sided cows were born in 2007 in Rural Retreat, Virginia, USA.(Photo: Metro.co.uk)

The cat is two-sided in the state of Rhode Island, USA, born in July 2012, but only lived a few days later.(Photo: NBC News)

A 6-legged sheep was born on March 18, 2006 in Belgium.(Photo: AFP)