A £1,000 reward has been offered for anyone who has information about a buzzard which was found with serious injuries.
Humberside Police and the RSPB say the injuries are similar to those which may have been caused by illegal trapping.
The buzzard was found alive on 21 January on the Sledmere Estate, near Driffield in the East Riding of Yorkshire, missing one of its feet and with broken tail feathers, immediately raising concerns of illegal trapping. It could not recover from its injuries and the bird was euthanised.
The practice of placing spring traps in exposed positions to deliberately target bird of prey has been illegal since 1904 and carries a maximum penalty of a £5,000 fine and or six months imprisonment.