Due to its location, the Park has very few mammals, with the most obvious ones being Grey Squirrel and Red Fox. There is a fairly healthy population of both the soprano and common pipistrelle bat and a few noctules, though their numbers have declined in recent years. The water bodies are home to healthy populations of common frog and toad and palmate newts are sometimes seen around Queen Mary’s Gardens. The lake was once home to large shoals of roach and perch. The former is now extinct, and the latter has dwindled dramatically, possibly due to the increase in the number of cormorant that use the park as a roost site – particularly during the winter, when over 60 have been recorded.