Police have started an unusual investigation after a hamster was put inside an envelope and posted.
Amazingly the hamster survived the envelope and the postbox she was pushed into after a postman rescued her.
He spotted something moving around as the hamster tried to nibble her way to safety, out of the envelope.
Patrick Von Heimendahl, a vet who examined the animal, told the BBC: "I find this utterly cynical to post a hamster. She is lucky to survive."
He added: "I don't think she would have survived for very much longer."
The hamster - who was found on Wednesday - is thought to have been in the box for around four hours.
Anyone with information should contact Cambridgeshire Police.