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This Monkey’s Call Sounds Like a Garbage Disposal

One of the first animals you’ll see when you walk into our Wortham World of Primates are our Black Howler Monkeys! You may hear them before you see them:

Howler monkeys are thought to be not only the loudest primate on the planet, but possibly one of the loudest living land mammals in the world. Their garbage-disposal like call can be heard up to 3 miles away in a dense forest. Our howler monkey troop tends to start calling in reaction to the leaf blowers we have on grounds in the early mornings.

Here at the Houston Zoo we have two howler monkeys. Vida is 23, and Garcia turned 22 on October 2nd. Vida and Garcia were both born here in Houston and are sisters.

Female black howler monkeys are brown.

You may be looking at our lovely, tan-brown, ladies thinking “If they’re called ‘Black Howler Monkeys’, why aren’t they black?” Well, the male monkeys are black, and the females are tan-brown! All howler monkeys are born a tan color to help them camouflage easily in the forest canopy, but the males develop the black color as they get older and the females remain tan in color. Males are also much larger than the females.

Vida and Garcia may be difficult to tell apart by just a glance, but if you study their faces you can tell that Garcia has a much smaller and shorter face, while Vida’s face is wider and longer. Vida tends to be braver than Garcia and is always ready to explore enrichment items or new objects placed in the exhibit by her keepers. Garcia however, likes to wait to see if new things are safe before exploring. Both girls are very smart and participate in regular training sessions with their keepers.

Our howler pair has a variety of favorites that they enjoy. They will always come greet their keepers if there is a fig or hibiscus flower in hand. They react best to food enrichment when there are frozen bananas involved. They love hard-boiled eggs and avocado. The howler monkeys also really enjoy when their keepers hang up mirrors for them, because they absolutely love staring at themselves, and we don’t blame them!

A lot of our guests often wonder why our howlers are sleeping for a large portion of the day, and it’s not because they’re just lazy! In the wild, the howler monkey diet consists mostly of leaves and a small variety of fruits and nuts. Due to the lack of calories in their diet howler monkeys tend to sleep for a majority of their day, about 80%, saving their energy for the important things, like foraging for food and calling to defend their territory!

During the month of October the primate team at the Houston Zoo puts on a Howlerween fundraiser to help raise money for Wildtracks; an organization that cares for and rehabilitate orphaned, injured, and sick howler monkeys back into the wild.

The next time you are walking through our Wortham World of Primates make sure to say hello to our duo!