Rare Footage Shows the Cuddly Sleeping Habits of Sharks

iStock
iStock

New video footage captured by scuba divers in Revillagigedo, Mexico, shows the common—but rarely recorded—sleeping habits of sharks. In it, a pack of whitetip reef sharks can be seen piled on one another in a cuddly, sleep-like state.

It is important to note that "sleep" means something much different for sharks: Unlike human beings, sharks do not enter an unconscious state when they sleep—rather, they toggle between "wakeful" and "restful" states. Little is known about what transpires during this period of rest.

Apart from its rarity, this footage is significant in that it offers a clear case against a popular myth: that sharks need continuous movement to avoid drowning. While it is true that some species, like great whites, move during resting periods for oxygen, whitetip reef sharks can remain completely motionless while still receiving water through their spiracles. They often rest during the day and feed at night on small bony fishes, octopuses, and crabs.

Watch the full video from National Geographic below:

11 Masks That Will Keep You Safe and Stylish

Design Safe/Designer Face Covers/Its All Goods
Design Safe/Designer Face Covers/Its All Goods

Face masks are going to be the norm for the foreseeable future, and with that in mind, designers and manufacturers have answered the call by providing options that are tailored for different lifestyles and fashion tastes. Almost every mask below is on sale, so you can find one that fits your needs without overspending.

1. Multicolor 5-pack of Polyester Face Masks; $22 (56 percent off)

Home Essentials

This set of five polyester masks offers the protection you need in a range of colors, so you can coordinate with whatever outfit you're wearing.

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2. 3D Comfort Masks 5-Pack; $20 (25 percent off)

Brio

The breathable, stretchy fabric in these 3D masks makes them a comfortable option for daily use.

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3. Reusable Face Masks 2-pack; $15 (50 percent off)

Triple Grade

This cotton mask pack is washable and comfortable. Use the two as a matching set with your best friend or significant other, or keep the spare for laundry day.

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4. Active Masks 3-pack; $23 (14 percent off)

RipleyRader

Don’t let masks get in the way of staying active. These double-layer cotton masks are breathable but still protect against those airborne particles.

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5. Washable Protective Cotton Face Masks 2-pack; $13 (35 percent off)

Its All Good

Avoid the accidental nose-out look with this cotton mask that stays snug to your face.

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6. Washable 3D Masks 12-pack; $24 (44 percent off)

Elicto

With this 12-pack of protective masks, you can keep a few back-ups in your car and hand the rest out to friends and family who need them.

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7. Reusable Dust-Proof Mask with 5 Filters; $22 (45 percent off)

Triple Grade

This dust-proof mask can filter out 95 percent of germs and other particles, making it a great option for anyone working around smoke and debris all day, or even if you're just outside mowing the lawn.

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8. Reusable Fun Face Cover / Neck Gaiter (Flamingo); $20

Designer Face Covers

Channel some tropical energy with this flamingo fabric neck gaiter. The style of this covering resembles a bandana, which could save your ears and head from soreness from elastic loops. Other designs include a Bauhaus-inspired mask and this retro look.

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9. Seamless Bandana Mask; $8 (52 percent off)

Eargasm Earplugs

This seamless gaiter-style mask can be worn properly for protection and fashioned up into a headband once you're in the car or a safe space. Plus, having your hair out of your face will help you avoid touching your eyes, nose, and mouth before washing your hands.

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10. Two-Ply "Love" Face Masks 2-Pack; $18 (40 percent off)

Design Safe

These statement masks allow you to have a voice, even if your mouth is covered.

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11. Neoprene/Fleece Neck and Face Mask (Purple); $10 (66 percent off)

Its All Good

This mask will definitely come in handy once winter rolls around. It features a fleece neck, face, and ear covering to keep your mask secure and your face warm.

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Prices subject to change.

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links. If you haven't received your voucher or have a question about your order, contact the Mental Floss shop here.

A Two-Toed Sloth Accidentally Hitched a 40-Mile Ride in a Truck's Engine Bay

Tony Hisgett, Wikimedia Commons // CC BY 2.0
Tony Hisgett, Wikimedia Commons // CC BY 2.0

Most sloths move at a maximum speed of 6 to 8 feet per minute, but one two-toed sloth in Costa Rica shattered that pace on a recent joy ride. As Jalopnik reports, the female sloth traveled 40 miles after sneaking into a truck’s engine bay undetected.

The vehicle's drivers noticed something was out of place when they stopped to check the engine and saw a tuft a fur. They reached out to Toucan Rescue Ranch, a wildlife rehabilitation center near San Jose, which identified the stowaway as a two-toed sloth. Though it had been on board for over an hour, the animal managed to survive the road trip unscathed.

The animal caretakers at TRR dubbed the sloth Lola la Trailera, or "Lola the Truck Driver," after the 1983 Mexican action movie of the same name. She was exhausted and aggressive when she arrived at the center, but after feeding her a diet of Pedialyte, wild leaves, and steamed veggies, the caretakers were able to restore her to full health. She was returned to the forest she originated from following six days of rehabilitation.

A sloth's usual lack of speed isn't a sign of laziness—it's a survival tactic. Fat and protein are limited in the rainforest canopies where sloths reside, so they must conserve energy by limiting their activity. But as Lola la Trailera proved, sloths have the potential to move much faster with a little assistance.

[h/t Jalopnik]