Barn owl on Michael Calvert's farm near Greyabbey
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Ulster Wildlife asks public to listen out for 'snoring' owls

Ulster Wildlife has asked people in the countryside to listen out for the sound of snoring to help track one of our most elusive night-time predators.

The nature charity says young barn owl chicks make the sound when they are calling for food from their parents.

It is believed there are only between 30 and 50 breeding pairs of the red-listed species in Northern Ireland.

And experts know of just three active nest sites.

One of those nests is on Michael Calvert's farm near Greyabbey in County Down.