An endangered species charity is inviting the public to record sightings of mammals, dead or alive.

This summer, wildlife charity the People's Trust for Endangered Species (PTES) has asked for those in the passenger seat whilst driving along Britain's road networks to count the mammals as part of its annual Mammals on Roads survey.

Information collected will help the charity to spot changing trends in populations and identify where conservation action is needed most.

According to a recent report by the Mammal Society, one in five wild mammal species in Britain is at risk of extinction.

David Wembridge, surveys officer at PTES said: "At the moment, a lot of what we know is still a 'best guess' and what we really need are good records of mammals and all sorts of species, more generally.

"Better estimates of numbers will help us understand our wildlife and the 'natural health' of the nation."

This year, the survey will take place from now until Sunday, September 30, and participants can take part either online or via an app on a smart phone or tablet.

Over the three months, PTES is asking families, car-sharing commuters or anyone on Britain's roads to record sightings of mammals and submit the records online, at ptes.org/mor