Marsh Harrier (Circus aeruginosus) is a medium-sized, slender hawk. It is also known as Western Marsh Harrier. The female is considerably larger than the male. They are identified by long, narrow, rounded tails, small beaks and long, slender legs. The most notable feature is the owl-like ruff of facial feathers that cover unusually large ear openings. Diet consists of small birds and mammals.