Amateur bird-watchers are being encouraged to listen out for the call of the tawny owl as part of a nationwide study.
Researchers are urging members of the public to listen out for the classic ''twit-twoo'' of the owl for 20 minutes each week.
The British Trust for Ornithology hope to gather data on the number of tawny owls amid fears that their numbers are declining.
Jo Edwards, from Festival Park Owl Sanctuary in Ebbw Vale, believes modern day farming practices could be one reason why numbers might be falling.
Experts hope the Tawny Owl Calling survey, which runs from 30th September 2018 to 31st March 2019, will help them understand if, and where, the bird may be in decline.