I like the way these two are just lazing about on a branch (well, it was hot). And despite being 80 feet up in the air (the photo is taken from a platform) they're not even bothering to hold on with all their limbs. One of those very clear reminders you get from animals sometimes that you're in their environment.
Oh, they're howler monkeys, by the way. They make a sound like lions roaring when they hear you coming. These ones weren't up for much howling though.