12 Things You Might Not Have Known About Manatees

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iStock

In August 2015, the U.S. Fish and Wildlife Service temporarily closed Three Sisters Springs in the Crystal River after more than 300 manatees rapidly moved into the springs. “We have a record number this year,” Laura Ruettiman, an environmental education guide at the Springs, told USA TODAY. “We have 150 more manatees here than have ever been recorded in the past.” Here are a few things you might not have known about these cute, cuddly aquatic mammals.

1. "Manatee" comes from the Carab word manti, meaning “breast, udder.” These docile creatures are also called sea cows.

2. Manatees live in coastal waters and rivers, and they’re the ocean’s largest herbivores: An adult can grow up to 13 feet long and weigh as much as 1300 pounds—and consume 10 to 15 percent of its body weight in vegetation each day.

3. Using their powerful tails, manatees can swim for short bursts at 15 mph. However, the placid animals are usually content to cruise along at 5 mph.

4. There are three species of manatee: West Indian (Trichechus manatus), West African (Trichechus senegalensis), and Amazonian (Trichechus inunguis). The aquatic mammals belong to the order Sirenia, which also includes the dugong (Dugong dugon) and the Steller's sea cow, which went extinct in 1768 due to overhunting.

5. According to a ship log dated January 9, 1493, Christopher Columbus himself said that on the previous day he “distinctly saw three mermaids, which rose well out of the sea; but they are not so beautiful as they are said to be, for their faces had some masculine traits.” Columbus wasn’t the only sailor to spot mermaids in the water. The reason they weren’t as beautiful as he might have imagined is because they were actually manatees.

6. Though they can hold their breath while submerged for 15 to 20 minutes, manatees usually surface every three to five minutes to breathe. With a single breath, manatees can replace 90 percent of the air in their lungs; humans, by comparison, replace just 10 percent.

7. Remember when that lady rode a manatee in Florida a few years ago and got arrested? That’s because West Indian manatees are protected by the Manatee Sanctuary Act, which states that it’s against the law for “any person at any time, by any means, or in any manner intentionally or negligently to annoy, molest, harass, or disturb or attempt to molest, harass, or disturb” the endangered animals.

8. Manatees are closely related to two land mammals: the hyrax and the elephant. While most animals have a heart that has a point, elephants and manatees have hearts that are rounded on the bottom.

9. The endangered animals are threatened by a number of things, including toxic red tide and run-ins with watercraft. According to Florida Today, 361 of Florida’s West Indian manatees died in 2014; 19 percent of the overall death toll came from watercraft.

10. Manatees have 2000 thick, whisker-like hairs called vibrissae on their faces, and 3000 on their bodies. These innervated follicles help the manatee sense and explore the world around it.

11. The manatee has a smooth brain, and the smallest brain of all mammals in relation to its body mass. But that doesn’t mean they’re stupid: According to a 2006 New York Times article on the work of Roger L. Reep, a neuroscientist at the University of Florida at Gainesville, manatees are “as adept at experimental tasks as dolphins, though they are slower-moving and, having no taste for fish, more difficult to motivate.”

12. Manatees are nearsighted and can see in blue, green, and gray—but not red!

It 'Rained' Spiders in Brazil Last Week—and You Can Watch It If You Dare

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iStock.com/aury1979

If recent events are anything to go by, you should be less concerned about swallowing spiders in your sleep and more concerned about bird-eating spiders raining down on your head. As The Guardian reports, recent footage from the Brazilian countryside shows thousands of spiders seemingly suspended in mid-air. (Arachnophobes might want to give the video below a miss.)

In reality, they aren’t falling at all. The spiders, which likely belong to a South American species called Parawixia bistriata, are merely crawling on an ultra-fine and nearly invisible web that attaches to two objects, like trees or bushes, to form a canopy.

So why do they do it? To catch prey, naturally. They’re likely to snag a variety of insects and maybe even small birds in their communal web, which can stretch up to 13 feet wide. (And yes, they eat the birds, too.)

Brazilian biology professor Adalberto dos Santos tells The Guardian that P. bistriata are some of the rare “social” spiders that do this. They leave their webs up overnight, hide out in the nearby vegetation, and then return at dawn to feast.

While this natural phenomenon is certainly unsettling, it isn’t exactly rare. Residents of the southeast municipality of Espírito Santo do Dourado, where the video was shot, said these “spider rains” are common when the weather is hot and humid.

Here’s another video from Santo Antônio da Platina in southern Brazil in 2013.

Other species of spider have been known to jump into the wind and "surf" on strands of silk as a means of getting around. They do this to escape threats or get to food or mates in other locations, and cases of "spider flight" have been recorded all over the world. Some especially adventurous spiders have even been known to cross oceans by “ballooning” their way from one land mass to the next.

[h/t The Guardian]

FDA Recalls Several Dry Dog Foods That Could Cause Toxic Levels of Vitamin D

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iStock.com/Chalabala

The FDA has recalled several brands of dry dog food that contain potentially toxic levels of vitamin D, The Atlanta Journal-Constitution reports. While vitamin D is essential for dogs, too much of the nutrient can result in kidney failure and other serious health problems.

The FDA has already received reports of vitamin D toxicity in dogs that consumed certain dry foods. Pet owners are advised to stop using the following products:

Old Glory Hearty Turkey and Cheese Flavor Dog Food (manufactured by Sunshine Mills, Inc.)

Evolve Chicken & Rice Puppy Dry Dog Food (Sunshine Mills, Inc.)

Sportsman's Pride Large Breed Puppy Dry Dog Food (Sunshine Mills, Inc.)

Triumph Chicken & Rice Recipe Dry Dog Food (Sunshine Mills, Inc.)

Nature's Promise Chicken & Brown Rice Dog Food (Ahold Delhaize)

Nature's Place Real Country Chicken and Brown Rice Dog Food (Ahold Delhaize)

Abound Chicken and Brown Rice Recipe Dog Food (sold at Kroger in Louisville, Kentucky, as well as King Soopers and City Market stores in Colorado, Utah, New Mexico, and Wyoming)

ELM Chicken and Chickpea Recipe (ELM Pet Foods, Inc.)

ELM K9 Naturals Chicken Recipe (ELM Pet Foods, Inc.)

ANF Lamb and Rice Dry Dog Food (ANF, Inc.)

Orlando Grain-Free Chicken & Chickpea Superfood Recipe (sold at Lidl stores)

Natural Life Pet Products Chicken & Potato Dry Dog Food

Nutrisca Chicken and Chickpea Dry Dog Food

For the full list of UPC and lot numbers involved in the recall, visit the FDA's website.

Symptoms of vitamin D poisoning usually develop 12 to 36 hours after pets consume a suspect food, according to PetMD. The FDA says those symptoms include vomiting, loss of appetite, increased thirst, increased urination, excessive drooling, and weight loss. "Customers with dogs who have consumed this product and are exhibiting these symptoms should contact their veterinarian as soon as possible," the FDA writes.

The agency says the situation is still developing, and it will update the list of recalled brands as more information becomes available. According to WKRN News, veterinary professionals recommend sticking to dog foods that have an AAFCO label (from the Association of American Feed Control Officials) on them.

[h/t The Atlanta Journal-Constitution]

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