Shepreth Wildlife Park in Cambridgeshire has fitted 24 hedgehogs with GPS backpacks, to find out how they survive in the wild.
The hedgies have all been nursed back to health by the Wildlife Park's hedgehog hospital.
Shepreth Wildlife Park
A small section of spines on the hedgie's back is clipped back, and the GPS is glued on.
bbc.co.uk
This is performed while the hedgehog is under anaesthetic during their health check. The GPS will fall off naturally, when the hedgie sheds its spines.
