Puffins to be tracked with GPS

Puffins are to be fitted with satellite transmitters for the first time in an effort to understand why their numbers have fallen by about a third in five years.

Possible reasons include climate change causing the seabirds' main food source, sand eels, to move north to cooler waters.

British scientists will fit global positioning system technology to puffins to find where they go to feed in winter, how they get there and how long they stay in different areas.