Great place to draw and not only animals, the greenery around is fantastic too, some groups of people and/or individuals are also worth a shot.
Anyway, a great few hours scattered here and there with the inevitable thought of 'some of these animals look really out of place...'. Fantastic opportunity to see them live and in motion otherwise.
Btw I just read at 'Lines and Colors' about the 'Freelancers Union' (see links). -Very- interesting.