This is an Official Postcrossing card from Oregon! This was from a visit to Costa Rica, a small country located in Central America. Featured are four members of Costa Rica’s faunal population! From left to right, top to bottom, we have the squirrel monkey, the howler monkey, the spider monkey, and the white-faced monkey. Let’s learn a bit about all of them! So first, we have the squirrel monkey, a very small primate that usually measures around 33 cm in body length, and a bit more of that in tail length. Contrary to quite a few other monkeys, the tails of squirrel monkeys can’t be used to grab onto things (like branches). Instead, they’re used to keep their balance. (Fun fact: the word used to describe a tail that can hold onto things is “prehensile”.) Nonetheless, squirrel monkeys spend much of their time in the trees, and usually in very large groups – sometimes up to a few hundred! Next is the howler monkey, which are larger than squirrel monkeys and DO have prehensile tails. Their trademark feature is – as you might imagine from their name – their incredibly loud cries. They’re considered to be the loudest land animals in the world, with howls that can sound almost as loud as jets taking off! Their yells can be heard from 5 km away, even through heavily vegetated forests. This is helpful for when groups of these animals want to locate each other. Then we’ve got the spider monkey, which is the only one I’ve heard of prior to receiving this card. Spider monkeys have long limbs and long, prehensile tails, and they get their name from how they look when they hang down from trees. Like squirrel monkeys, spider monkeys are also very social, and they’re extremely intelligent and have very good memory. Unfortunately, spider monkeys are also hunted quite a bit by humans, even with strict prohibitions in place for exploiting them. Lastly, we have the white-faced monkey, or the capuchin monkey, which is probably one of the most well-known monkeys. You know those guys who have those mobile musical organs at fairs or carnivals, featured in shows or movies with a monkey companion? Those are usually white-faced monkeys! White-faced monkeys, like howler and spider monkeys, have prehensile tails, and they have a sort of chirp that they use to warn other monkeys around of predators in the area. I took a listen to this chirp and it’s kind of like the typical cry that you would expect from a little monkey (reminds me of Ukiki from Super Mario 64 – can always make a video game reference to anything). Thank you so much for sending me this wonderful postcard, Carley!