There’s a moment that happens to almost every guest on their first morning at Vista Bendita. It’s barely light, the air is cool, and from somewhere out in the rainforest comes a sound like a lion’s roar crossed with a gathering storm — deep, guttural, and far bigger than any animal that small has a right to make. The first time, it’s genuinely startling. By day three, it’s your favorite alarm clock.
Meet the mantled howler monkey — mono congo to Costa Ricans — the loud, leaf-eating, gloriously lazy soul of this forest. Here’s everything you’ll want to know when you hear (and hopefully see) them.
When Are They Active?
Howlers run on a rhythm that’s easy to learn and fun to plan around:
- Dawn (and dusk): This is the famous one. Males open the day with a thunderous chorus of roars, and they call again at dusk. It’s not aggression — it’s communication (more on that below). If you want the full surround-sound experience, be on the deck with a coffee right around first light.
- Mid-morning nap: After serenading the forest, the troop typically settles in for a rest. Howlers are unbothered by your schedule.
- The truth about howlers: they are professional loungers. Because of their diet (again, more below), they sleep through the night and spend up to about 75% of the day resting. Active movement and socializing may add up to under an hour a day. They share the sloth’s philosophy: why rush?
So your best viewing windows are the cooler hours — early morning and late afternoon — when they’re most likely to be calling, feeding, and on the move.
That Sound: How and Why
The howler’s roar is the headline act, and the biology behind it is wonderful:
- Males have a hugely enlarged hyoid bone — a hollow, resonating bone near the vocal cords that works like a built-in amplifier and balloons outward as they call.
- The result carries an astonishing distance — up to three miles, even through dense jungle. Howlers are often called the loudest land animal in the Americas (and among the loudest on Earth).
- Why bother? It’s an energy-saving strategy. Roaring lets neighboring troops locate each other and stake out territory without anyone having to move, fight, or burn precious calories. A monkey on a low-energy diet can’t afford to waste energy on confrontation — so they settle it by shouting across the canopy instead. Brilliant, really.
- Local lore (passed down by Indigenous communities) even holds that when the calls grow louder and more frequent, a change in the weather is coming. Listen for it during the green season.
Every kid in Costa Rica learns to imitate the howler call — it’s a national tradition. Give it a try from the deck; you probably won’t get an answer, but you’ll have fun.
What They Eat & Where They Forage
Here’s the key to understanding everything about howler behavior: they are folivores — leaf-eaters. In fact, the mantled howler is the only Central American monkey that eats large quantities of leaves, and that single fact explains their whole laid-back lifestyle.
- Mostly leaves: Leaves are everywhere in the rainforest, so there’s no shortage of food — but they’re low in energy and hard to digest, which is exactly why howlers rest so much. Eating leaves means living slowly.
- Picky about it: Howlers are leaf connoisseurs. They favor tender new growth, which has fewer of the bitter tannins and toxins that mature leaves develop, and they’re selective about which trees make the cut.
- Seasonal fruit and flowers: Leaves are the staple, but when fruit comes into season it can become a major part of their diet for a while, and in the dry season flowers feature heavily. They’re especially fond of Ficus (strangler fig) and Cecropia trees — the same Cecropia the sloths love.
- Where they forage: high in the canopy, moving unhurriedly through the treetops in troops, using that long prehensile tail as a fifth limb to anchor and reach. Around Vista Bendita, scan the upper branches of fruiting and fig trees, especially morning and late afternoon.
A lovely side effect: because over 90% of the seeds they eat pass through unharmed, howlers are important seed dispersers — quietly replanting the very forest they live in.
A Few More Fun Facts
- The name: “Mantled” comes from the long golden guard hairs along their sides, which stand out against their otherwise black coats. In Costa Rica they’re monos congo.
- Family life: they live in troops — usually around 10–20 monkeys, occasionally many more — led by a dominant male, with females, young, and a charming bit of “auntie behavior,” where females help care for one another’s babies.
- Built for the trees: their tail can be longer than their body and is strong enough to support their full weight — handy for a 22-pound monkey hanging out (literally) in the canopy.
- Tougher than most: howlers cope with habitat disturbance better than some of their relatives, which is part of why they’re the most commonly seen and heard monkey in Costa Rica. Still, they need connected forest, which is one more reason this protected stretch of coast matters.
How to Watch Them Well
- Listen first, look second. You’ll hear them long before you see them. Follow the roar to find the troop.
- Be out at dawn or dusk — peak calling and feeding hours.
- Look high and scan the fig and Cecropia trees for slow movement in the upper canopy.
- Use binoculars — they’re high up and often half-hidden in leaves.
- Keep your distance and never feed them. Watch the wild show on its own terms; a fed monkey becomes an unhealthy, problem monkey (see our mindful traveler’s guide).
- Just enjoy it. Honestly, the howlers are as much an audio experience as a visual one. Some of the best monkey moments here are simply lying in bed or sipping coffee, listening to three or four troops roaring back and forth across the valley.
The Sound of the Jungle Waking Up
People come to Costa Rica chasing the dramatic sightings — the macaw in flight, the sloth in the tree. But ask returning guests what they remember most, and a surprising number say it’s the howlers: that primal, rolling roar rolling across the rainforest at dawn, the unmistakable sound of the jungle waking up around them. It’s wild, it’s free, and at Vista Bendita it comes with the view. Set your coffee for sunrise and listen for it.
Woke up to the howlers during your stay? Tell us about your first reaction in the comments — everyone remembers theirs.
Stay at Vista Bendita
After a day exploring waterfalls, beaches, whale watching tours, restaurants, and rainforest adventures, relax in the peaceful mountain setting of Vista Bendita overlooking Costa Rica’s South Pacific coast.
Enjoy ocean views, tropical wildlife, a private pool, and easy access to some of the region’s best experiences near Ojochal and Uvita.
More Details & Local Travel Tips
Browse our blog for information on:
- The Vista Bendita wildlife show: what you’ll see from the deck
- In search of sloths
- Scarlet macaws & the parrots of the South Pacific
- Wildlife & bird watching
Explore the Vista Bendita Travel Blog
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