The rats now outnumber humans in the Iranian capital, which has a population of over 12 million people.

While it is not entirely clear what the Tehranian rats deformities entail, one University professor from the city has said that the changes he has seen in the city’s rat population in his lifetime would normally have taken “millions of years”.

Rats have been a problem for the people of the Iranian capital since there has been a Tehran, but many rats seem to have become resistant to the types of poison that has been used to combat them.

Out of desperation the city has turned to the rather science fiction sounding solution of posting snipers around Tehran to battle the mutant rats.

Head of the environment agency, Mohammad Hadi Heydarzadeh has said the specially trained snipers will only be deployed at night.

“It’s become a 24 hour war.” he said.”We use chemical poisons to kill the rats during the day and the snipers at night.”