Beth Elsender, 19, with Aristotle the Harris Hawk, which is being used in the park to deter Seagulls humanely August 27 2015. Eagles and hawks have been spreading their wings across Sunderland's Mowbray Park to help deter city centre seagulls. The park and its large ornamental pond are a favourite with visitors during school summer holidays. Yet, the City Council annually receives dozens of complaints that aggressive gulls are a nuisance.