The key facts

  • A calf named Spider was born in Australia with additional legs growing from its head
  • The surgery to remove the extra limbs lasted about one and a half hours, and the calf's condition quickly improved
  • The exact cause of the anomaly has not been established; possibilities include a 'parasitic twin,' developmental disorders, and genetic mutations

Unusual Calf in Australia

In Australia, a calf named Spider was born with extra legs growing from its head. This was reported by Naked Science, citing a message from ABC. Veterinarian Megan Smith, who examined the animal, said that in 20 years of practice, she had never encountered such a case.

Surgery and Risks

According to specialists, if the extra legs had not been removed, various problems could have arisen as the calf grew older, including difficulties with maintaining balance. The surgery to remove the extra limbs from Spider's head lasted about one and a half hours. After the intervention, the calf's condition improved rapidly.

Possible Causes

Imke Tammen, a specialist at the School of Veterinary Science at the University of Sydney, stated that it is currently impossible to name the exact cause of the anomaly. One probable explanation is the phenomenon of a 'parasitic twin,' where during early embryonic development, one fetus absorbs a less developed twin, and parts of the second body may remain attached to the developing organism. However, Tammen did not rule out other causes; according to her, some developmental disorders can also lead to the appearance of extra legs.

Genetics and Frequency of the Phenomenon

In some cattle breeds, similar cases are linked to hereditary genetic diseases. Science is aware of certain genetic mutations associated with the development of extra limbs, but it has not been confirmed that these were the cause of Spider's anomaly. There is also no precise data on how often animals with extra legs are born.