Page last updated at 16:57 GMT, Thursday, 29 April 2010 17:57 UK

Vole surge in Kielder Forest boosts owl population

Baby tawny owls
The more voles there are, the more eggs the birds can lay

The tawny owl population in a Northumberland beauty spot is booming as a result of the harsh winter, experts say.

The Forestry Commission say their growth at Kielder Forest is due to an increase in the number of voles, which the birds of prey feed on.

The large amount of snow which fell over the winter allowed voles to hide from predators and breed successfully.

The forest is currently home to 105 nesting pairs of tawny owls.

Martin Davison, an ornithologist with the Forestry Commission, said: "With all the young voles available now, the tawny owls have cashed in on that and the population is doing really well.

"At Kielder we have 105 nesting pairs, with eggs. And excitingly, this year, we have four clutches of five eggs which is the most tawny owls ever lay.

Vole record

"This is undoubtedly linked to the number of voles. The more voles there are, the more eggs the birds can lay.

"In a good year like this the chicks have more voles than they can eat and in one box we found a record 49 voles waiting to be eaten and the chicks were already stuffed to the gunnels."

A brood of tawny owl chicks, which were about 21 weeks old, have been ringed with identification tags as part of an ongoing research project at Kielder Forest.

Mr Davison said: "We need to ring all the chicks to record whether it's the same bird or a new bird using the territory.

"The only way we can do that is by using a ring on the leg as it's a great way of identifying the bird."

The Forestry Commission has been studying the birds for 30 years and there are almost 300 nesting boxes erected in the area.

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