If you are stuck in a hotel in London and sick of pounding the pavement for shopping and food, Hyde Park offers a respite right in town. Mammals include the cute squirrels. The ones you will see have been introduced from North America. They have displaced the native Red Squirrels. They are still cute, though. Birds include the original (European) Magpie (with quite a beautiful blueish sheen). There are plenty of ducks, including native species, including the striking Tufted Duck. Birds and squirrels are fed, but don't feed the pigeons...!