The relative freedom from disturbance and the wide variety of habitats have encouraged many different plants and animals to make the Park their home.
The famous Margam Deer Herd today roams through approximately 500 acres (200 hectares) of parkland. It dates from Norman times, the herd, originally exclusively fallow is of excellent genetic quality to rival any herd in the British Isles.
Among the more common mammals to be seen are foxes, badgers, hares, grey squirrels, voles and shrews. Moles are abundant on the lower parts of the park, their presence betrayed by molehills.
Mute Swans, Coots, Moorhens, Canadian Geese, Mallard, Tufted duck and Pochard inhabit the lakes, whilst the patient observer may see Kingfishers besides the streams. Skylarks, Stonechats and Wheatears can be seen over the grasslands with Buzzards, Kestrels and occasional Red Kite in the skies.