You'll probably encounter more howler monkeys than tourists amid the intricately carved stelae and temples where the " Jaguar" clan thrived from 500 to 700 A.D.
To study the animals' roars, the team measured the volume of a howler bone in their throats which act like a resonator, the larger that bone, the deeper that voice.
The " babies are very delicate, they can't be in a house where there are dogs or cats" because they have diseases that can be deadly for howler monkeys, he said.
But when she was hired to help build a zoo, she met the animal that would change her life and theirs, the cotton-top tamarin, a little monkey with a look right out of Dr. Seus.
We, you know, we human beings, Well, I think song is actually the most intriguing one because there's no other mammal that is as interested in singing as we are, with the possible exception of gibbons and maybe howler monkeys.