England's biggest colony of puffins has seen the birds' numbers fall by a third in just five years, a survey shows.
Experts had expected to see a slight increase in the population on the Farne Islands, owned by the National Trust.
The Trust says the size of the decline is unprecedented, adding that it will carry out another survey in 2008 in order to monitor the situation.
BBC NEWS | Science/Nature | Unexpected fall in puffin numbers