There is something very unusual about this howler monkey. No, it is not unusual to see howler monkeys in Costa Rica. And it is even more common to hear them. But this howler was perched above our trail all by himself. I have never before seen a solitary howler monkey, as they are almost always in packs of between 10 and 20 monkeys.
Our guide told us that there was a pack of howler monkeys living in the woods nearby, but we did not find them. We don't know how or why this howler was separated from the group.
The low roar of howler monkeys can be can be heard at a distance of 3 km (1.8 miles) in the forest or 5 km (3 miles) across the water. That is not a typo. It is amazing for such a huge sound to come from such a small animal. They are typically 55 cm (22 inches) long, and weigh between 4 - 7 kg (9 -16 lbs). That makes them the largest monkeys in the western hemisphere.