Farne Islands 'puffin census' begins
17 May 2013 Last updated at 11:12 BST
A puffin "census" has started on the Farne Islands in Northumberland, with National Trust rangers surveying how many breeding pairs of the birds live there.
The count, which takes three months, takes place every five years. The last survey indicated numbers had fallen by a third.
Fiona Trott reports.