Academic study and the steady, mindful practice of religion slowly brought me back to life. I have kept up what some people would consider my strange religious practices. After one year of high school, I attended the University of Toronto and took a double-major Bachelor's degree. My majors were religious studies and zoology. My fourth-year thesis for religious studies concerned certain aspects of the cosmogony theory of Isaac Luria, the great sixteenth-century Kabbalist from Safed. My zoology thesis was a functional analysis of the thyroid gland of the three-toed sloth. I chose the sloth because its demeanour-calm, quiet and introspective-did something to soothe my shattered self.
There are two-toed sloths and there are three-toed sloths, the case being determined by the forepaws of the animals, since all sloths have three claws on their hind paws. I had the great luck one summer of studying the three-toed sloth in situ in the equatorial jungles of Brazil. It is a highly intriguing creature. Its only real habit is indolence. It sleeps or rests on average twenty hours a day. Our team tested the sleep habits of five wild three-toed sloths by placing on their heads, in the early evening after they had fallen asleep, bright red plastic dishes filled with water. We found them still in place late the next morning, the water of the dishes swarming with insects. The sloth is at its busiest at sunset, using the word busy here in the most relaxed sense. It moves along the bough of a tree in its characteristic upside-down position at the speed of roughly 400 metres an hour. On the ground, it crawls to its next tree at the rate of 250 metres an hour, when motivated, which is 440 times slower than a motivated cheetah. Unmotivated, it covers four to five metres in an hour.
The three-toed sloth is not well informed about the outside world. On a scale of 2 to 10, where 2 represents unusual dullness and 10 extreme acuity, Beebe (1926) gave the sloth's senses of taste, touch, and its sense of smell a rating of 3. If you come upon a sleeping three-toed sloth in the wild, two or three nudges should suffice to awaken it; it will then look sleepily in every direction but yours. Why it should took about is uncertain since the sloth sees everything in a Magoo-like blur. Beebe reported that firing guns next to sleeping or feeding sloths elicited little reaction. And the sloth's slightly better sense of smell should not be overestimated. They are said to be able to sniff and avoid decayed branches, but Bullock (1968) reported that sloths fall to the ground clinging to decayed branches "often".
How does it survive you might ask.
Precisely by being so slow. Sleepiness and slothfulness keep it out of harm's way, away from the notice of jaguars, ocelots, harpy eagles and anacondas. A sloth's hairs shelter an algae that is brown during the dry season and green during the wet season, so the animal blends in with the surrounding moss and foliage and looks like a nest of white ants or of squirrels, or like nothing at all but part of a tree.
The three-toed sloth lives a peaceful, vegetarian life in perfect harmony with its environment. "A good-natured smile is forever on its own lips," reported Tirler (1966). I have seen that smile with my own eyes. I am not one given to projecting human traits and emotions onto animals, but many a time during that month in Brazil, up at sloths in repose, I felt I was in the presence of upside-down yogis deep in meditation or hermits deep in prayer, wise beings whose intense imaginative lives were beyond the reach of my scientific probing.