Martita's GPS data proved a road crossing was dangerous for sloths. Now there's a canopy bridge there and howler monkeys used it within 24 hours.

When we think about the loss of forests, we usually imagine clear-cut deforestation. But across Latin America, another kind of forest loss is also happening…

From the trees above a busy beach cantina to the edges of the urban forest, Tender’s life gave us a rare glimpse into how sloths grow, move, and adapt in human-shaped landscapes. This is the story of a gentle sloth, the community that surrounded him, and the lessons he left behind.

If there’s one thing fieldwork teaches you, it’s that nothing ever goes entirely to plan, and that’s exactly what makes it exciting.

We don’t know how many sloths there are.
We don’t even know how many there should be.
And that’s a problem.

José Pablo Guzmán García is our sloth scientist in charge of the Urban Sloth Project (USP)and is also involved in other research initiatives, such as the Great Sloth Census.

What 35 million years of evolution reveal about resilience, extinction, and the role of humans.

Sloths are masters of camouflage, blending seamlessly into the dense rainforest canopy to avoid predators – and, unfortunately, researchers.

If you’ve been following our work, you might already know Deborah – a two-fingered sloth we’ve been tracking through the Urban Sloth Project for several years. 

It’s hard to believe we’re already heading into the fifth month of the year—while sloths may be slow, time certainly isn’t!

Last week, we went to the primary forests in search of new sloths to collar and monitor for the Urban Sloth Project.

Tender is no ordinary sloth. He’s a young, sweet explorer living near a beach bar in Costa Rica’s South Caribbean. But his story starts with someone equally extraordinary: his mother, Tiki.

We do a lot of work to help wild sloths, and it’s great when we receive, for example, reports of them using our canopy bridges; but besides the photo or the video, we don’t know anything else about those sloths. So it’s very interesting when we have the opportunity to closely study and follow a particular sloth because we can learn so much from them. Today we want to share with you the story of a very special sloth named Angel.

Trees, more trees. Ten, a hundred, a thousand, more?! The beginning of the Great Sloth Census (a different research project SloCo is conducting to study the population of sloths) is definitely not easy.

Studying the GPS locations of an animal that doesn’t move much is challenging compared to studying species that travel a lot, such as whales and cheetahs. When studying sloths, accuracy is what we need to focus on.

The Osa Peninsula, located in the South Pacific area of Costa Rica, is one of the most biodiverse hotspots on the planet, containing 2.5% of global terrestrial biodiversity in just 1,200 km²! On social media, you can see footage of tour guides constantly spotting tapirs, monkeys, and even jaguars.

Sloths are divided into two large groups: Bradypus, the three-fingered sloths that include the famous smiley and masked-face sloths, and Choloepus, the brownish ones with a pig-like nose and two fingers on each hand.

Social media is filled with photos and videos of people holding sloths (or other wildlife), and we are investigating the reasons behind this behavior, as well as public perceptions and experiences regarding encounters with sloths.

Tortuguero is one of the most unique places in Costa Rica. It’s a small village with no streets or cars, which makes sense, as there are no roads leading there.

Sloths in the wild learn everything from their mother: where to sleep, what to eat, and even when it’s time to climb down the tree to defecate.

This lovely pair was discovered in the beautiful garden of a local resort.   The owner contacted Dr. Cliffe, founder and executive director of The Sloth Conservation Foundation.

Many locals in the beach town of Puerto Viejo de Talamanca, where the Sloth Conservation Foundation is located, help Dr. Rebecca Cliffe and her team by alerting her when they find a sloth.

Back in June 2023, we ventured into the lush rainforest of La Selva Biological Station and Reserve to fit GPS collars on three sloths there: George, Misty, and Selvina.

As we welcomed 2024, the holiday season brought well-deserved breaks for part of our team. So, in true sloth style, we’ve started the year slowly but steadily. Let’s dive into the highlights of the first 31 days of this exciting new year!

What a year, huh?! Everything happened in 2023 for the Urban Sloth Project (USP)! We upgraded our technology by saying goodbye to our sloth backpacks and embracing collars with Daily Diaries Data Loggers and GPS trackers.

Habitat surveys are an essential part of the Urban Sloth Project (USP). In these surveys, we make eight squares, each 100 square meters, in the areas where sloths live. We collect GPS locations of the sloths and study the trees in these squares.

Are sloths drinking more water than before? Is the smoke from cars affecting the delicate micro-ecosystems of green algae and moths that sloths have in their fur? Are sloths affected by artificial lights?

On Saturday, 14 October, parts of the western hemisphere, including our little corner of the South Caribbean,  will experience a breathtaking celestial show: an annular solar eclipse.

Next month, we’ll be honoring the slowest mammal on Earth! We are gearing up (at our own un-slothful pace) to celebrate International Sloth Day, which is just three weeks away.

The Maned Sloth, also known as Bradypus torquatus, indigenous to the Atlantic coastal rainforest of Brazil, are threatened by human interference, hunting activities, deforestation, and habitat loss, as well as climate change that affect their behavior.