These guys are so ugly they are cute. They are actually endangered, but their numbers are on the rise thanks to a lot of people doing conservation. Their numbers declined in part of deforestation and hunting. They are herbivores and love the water. I have only been to La Selva twice and seen them both times we were there. They are usually pretty docile creatures and I have only heard of one attack on humans. They can get pretty big, depending on which species it is, there are several. So, if you do happen to any of these while you are out do keep your distance as they can run quite fast.