It is unclear whether this fox was born without back legs or whether they are a result of a traumatic event or injury.  However, the caption reads the following:

A couple have spoken of their shock seeing a two-legged fox nimbly picking its way through their lawn on its front legs “bolt upright like a human”. Experts say the fox is likely to have been disabled from birth and fed by humans. Phil and Jane Carter, who live in Ilkeston, said they spotted the fox and filmed it before it dashed off “like a rocket”. Subscribe to The Telegraph with our special offer: just £1 for 3 months. Start your free trial now: https://www.telegraph.co.uk/customer/… Get the latest headlines: https://www.telegraph.co.uk/ Telegraph.co.uk and YouTube.com/TelegraphTV are websites of The Telegraph, the UK’s best-selling quality daily newspaper providing news and analysis on UK and world events, business, sport, lifestyle and culture.