Greater scaup, black ducks, mallards, and Canada geese are the most abundant wintering birds. Bird species include more common lapwings, mallards, quails and pheasants. Canada geese, loons, mallards and seagulls are a common sight. Both lakes provide habitat for Canada geese, mallards, and other waterfowl. Domestic ducks are mostly polygamous, where wild mallards are monogamous. Domestic ducks have lost the mallard's territorial behaviour, and are less aggressive than mallards. There are also waterbirds like yellow-legged gulls, mallards, black-winged slits, little grebes and garganeys. Herons, little grebes, mallards, water rails, dippers and kingfishers live on the park's water bodies. The park's birdlife consists of both residential and migratory birds, such as geese and mallards. Domestic ducks have no territorial behaviour and are less aggressive than mallards. The area is known for its duck hunting, including mallards, divers and green-winged teal ducks. There are many varieties of duck; buffleheads, goldeneyes, mallards, and cormorants. The number of exotic waterfowl species such as mallards has reduced in recent years. It has been shown that offspring between mallards and the Hawaiian duck produce fertile offspring. The hybrids of mallards and the yellow-billed duck are fertile, capable of producing hybrid offspring.