The Scoop on Sloth Poop

By Jan Thornhill

Illustration from Kyle Goes Alone (Illustration: Ashley Barron)

I didn't plan to write a book about pooping sloths—honest, I didn't. What I planned was to write a fairly straight-forward information book about the myriad forms of life that call a rainforest tree "home." I started, as usual, by simply gathering information about likely candidates that I could focus on: snakes; frogs; birds; vines and lianas; insects; fungi; bromeliads and other aerial plants; and, of course, mammals. It was all coming together nicely...but then I hit on sloths.

(Fernando Flores, Wikipedia)

I've always liked sloths, those sleepy-eyed characters that hang upside with goofy grins on their faces, moving unbelievably slowly or not moving at all. I actually emulated sloths in my teens, at least that's what my parents suggested, though they usually just used the word "lazy."  

(J.C.D. Schreber, Die Säugthiere in
Abbildungen nach der Natur, 1855)*

So I started reading about sloths and it wasn't long before I came across the kind of startlingly wonderful information that makes my heart sing: sloths only poop once a week. And why do they only poop once a week? Because sloths really are slow. In fact, not only are they so slow-moving that researchers' motion sensing cameras are sometimes not triggered when they pass, their digestive processes are the slowest of any mammal.

(Charles Dessalines d'Orbigny, 1849)*

Sloths primarily eat leaves. Tree leaves, particularly thick, long-lasting tropical tree leaves, are not packed with nutrients, nor are they easy to digest since their cell walls are made up of cellulose and lignin—just like a tree's wood, bark and branches. The only way a sloth can digest this tough stuff is with the help of gut bacteria, and this process takes a long time—a single leaf can take a month to travel from one end of a sloth to the other! 

(J.C.D. Schreber, Die Säugthiere in
Abbildungen nach der Natur, 1855)*

I also learned that some sloths add another fascinating bit of behaviour to this slow digestion. Three-toed sloths only poop on the ground, despite the ground being an unbelievably dangerous place to spend time for a creature whose hanging-upsidedown-from-trees anatomy is ill-suited to walking—more than half of all sloth deaths are caused by predation during these weekly excursions. 

(1776)*

And then I found this video of baby sloths being "potty trained" at a sloth rescue centre in Costa Rica—just about the cutest thing I've ever seen. And suddenly I wasn't working on the book I thought I was working on anymore. Now I was writing a picture book called Kyle Goes Alone (Owlkids Books, illustrated by the brilliant Ashley Barron), the story of a young sloth's first trip to the ground alone, cheered on by camouflaged rainforest neighbours. I managed to work much of the above sloth poop information into the book, but I didn't have room for the following, even more entertaining information. 

Two-toed sloth (Albertus Seba, 18th Century)*

Three-toed sloths carry their very own ecosystems in their fur coats. Their hair is grooved, and in the humid rainforests where they live, these grooves are a perfect place for algae to grow, algae that can be plentiful enough in the rainy season that a sloth can appear to be completely green—not a bad colour if you live amongst green leaves. Along with algae, sloth hair also harbours all kinds of fungi, ticks, mites, and insects. Some of the insects are moths that, as adults, live nowhere else other than between the hairs of a sloth's thick coat. Their other life stages—egg, larva, and pupa—are all spent in...drum roll, please...sloth poop.

(Frederick P. Nodder, 1789)*

Here's how this works: The adult moths, which have no mandibles, so likely don't eat, hang around on a sloth, seeking out another moth of the opposite sex. Then they do what they're supposed to do, which is procreate. Pregnant females wait until that happy moment when the sloth's weekly urge to "go" drives it slowly down to the ground. Once on the forest floor, the sloth, which often carries around a third of its body weight in waste (imagine!!), uses its tail to carve a little hollow in the ground, then defecates. This is, of course, the moment the female moths are waiting for. They crawl out of the sloth's hair and flutter down to the hard pellets where they lay their eggs. Once the eggs hatch, the larvae have ample food, particularly since they have the advantage of having arrived before any other forest dung-eaters. They eat to their hearts' content and then pupate. When an adult emerges, it flies upwards to search out some sloth fur to take up residence and seek out a potential mate—a sloth that is likely to be the same one its parents lived on since these animals are very fond of certain trees and don't stray far from them.

(1889)

So what do three-toed sloths get out of this relationship? No one yet knows, but one possibility is that the moths somehow fertilize the algae that grows in the fur, which the sloths in turn might eat to supplement their otherwise poor diets. Unfortunately, no one has observed sloths eating algae from their coats, but it's possible they might do this as night when they are notoriously difficult to observe. 

(Maximilian Wied, Abbildungen zur
Naturgeschichte Brasiliens, 1822)

Other researchers are unconvinced that there is a symbiotic relationship between the moths and the sloths. They think that the sloths' habit of pooping on the ground at the base of their favourite tree is more about communication and procreation with other sloths, especially since a female in oestrus will go down to the ground every day. If this is true, the moths might just be opportunistically hitching rides on sloths so they can be "delivered" to the poop their offspring need to survive. 

(Ashley Barron)

Kyle Goes Alone (written by Jan Thornhill, illustrated by Ashley Barron), Owlkids Books, 2015

Baby Sloths get Potty Trained Video



*Many early animal illustrators never saw the animals they depicted, hence some pretty fabulous sloth pictures!

Firing the Confetti Cannons!

by L. E. Carmichael

Several members of the Sci-Why blogging team are celebrating big news, so we thought we'd bring the celebration to you. Join us as we pour umbrella drinks and dance in a rain of glitter!

L. E. Carmichael's book FUZZY FORENSICS: DNA FINGERPRINTING GETS WILD has been shortlisted for the 2014 Lane Anderson Award, along with Daniel Loxton's PLESIOSAUR PERIL and Maria Birmingham's TASTES LIKE MUSIC; 17 QUIRKS OF THE BRAIN AND BODY. The winner will be announced later in September.

Joan Marie Galat's book BRANCHING OUT: HOW TREES ARE PART OF OUR WORLD just won the 2015 Santa Monica Public Library Green Prize for Sustainable Literature Award. Check out the trailer for the book here. Joan's next book, DARK MATTERS; NATURE'S REACTION TO LIGHT POLLUTION is coming out next year, but she's already talking it up on CBC.

Paula Johanson put her research skills to work writing KING KWONG, a biography of Canadian hockey player Larry Kwong. She found hockey statistics available online for every professional league in North America! King Kwong was reviewed on page 3 of the Vancouver Sun by Stephen Hume. As he says in his August 5 column: B.C. writer and self-described lifelong hockey fan Paula Johanson reminds us of the ephemeral nature of sports history in King Kwong, her marvellous little biography of the whirlwind on skates who blew out of the dusty interior 75 years ago.

Shar Levine will receive an Alumni Honour Award from the University of Alberta Alumni Association for her contributions to children's literature and science education. There will be a free ceremony with reception to follow at 7 pm, Thursday, Sept. 24, 2015 Northern Alberta Jubilee Auditorium (11455 87 Ave), Edmonton Alberta. For info and tickets, click here.

Five Rivers launched Marie Powell's young adult historical fantasy HAWK at When Words Collide in August. The first review is 5-star, calling it "a spell-binding, riveting YA historical fiction alive with character, conflict and action. Definitely a blow-your-mind debut novel."

Jan Thornhill's latest book KYLE GOES ALONE has just been released! Kyle has to go. There’s just one problem: as a young three-toed sloth, he lives high in the rainforest canopy with his mom, and it’s a LONG way down to the forest floor. Like other sloths, Kyle only goes down to the ground once a week when he has to do his “business.” And he’s never made the journey by himself before.

Kyle’s mom says he’s old enough to go alone, but Kyle isn’t sure he’s ready. It’s so far! And won’t it be lonely? Unfortunately, he doesn’t have much time to decide. Check it out!