Below, some video of an adult Barn Owl, trapped for ringing at a site in Duhallow. A pair was present, and had laid eggs, though these were subsequently abandoned. John Lusby, Raptor Officer with BirdWatch Ireland, after ringing the bird, describes how the owl moults (replaces) wing feathers and how you can work out the age of the bird. In this case, it is a bird in its third year.
Three year old Barn Owl, Duhallow, August 2013 (Filmed under licence: M.O'Clery).