We also saw a spider monkey, howler monkeys, a young crocodile, a tarantula (which Will held), and an animal I thought was a Coatimundi, but according to Wikipedia is correctly called a Coati. Like everywhere else in Central America, we also saw a wide variety of birds.
On the drive in from Belize, we saw a good variety of domestic animals. Horses were very common, in almost every yard and tethered on patches of grass beside the road. They are used for riding, and also as pack animals. We saw many pigs (and piglets), goats, sheep, chickens, ducks, turkeys and of course mangy dogs. We also saw many, many Brahman cattle. Guatemala must be a significant meat producing country (one of their beers has a Brahman as a logo).