The trail along the edge of the Green Lagoon passed by a grove of wildly growing trees. Overhead, a family of howler monkeys were activly hooting as we stopped to photograph them.

A baby howler monkey scamppered up a branch of its own.

A video of the howler monkeys shot with a Flip video camera.

A howler monkey suspended by its tail, was about to reach out to transfer to the next tree.

Using a long lens, this close-up of a howler monkey showed him gazing intently at another monkey nearby.

A juvenile howler monkey hung from a branch and eyeballed the camera lens, or perhaps the photographer, or maybe just the photographer's hat.

A howler monkey relaxed on a branch and waited for the tourists to depart.