Snakes on plains tracked via radio signals
A team of snake hunters are attaching tracking devices to adders to try to protect the future of what is Britain's only venomous snake.
The movements of more than 60 adders have been tracked on sites in Worcestershire, Herefordshire and Berkshire, to learn how they go around their natural habitat.
The team says humans shouldn't get too close as snakes can become stressed, which impacts reproduction. Another reason, of course, is that adders can bite.