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7 Clever Hunting Tricks Used in the Animal Kingdom

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The animal world is full of predators with some impressive tricks up their sleeves.

1. Sun-tracking sharks

Great white sharks are the largest predatory fish in the world, and perhaps the most famous of sharks, thanks to their starring role in the Jaws franchise. But new research suggests these creatures are also quite clever. Scientists from Flinders University in Australia now say white sharks can use the sun’s positioning to their advantage when hunting. On sunny mornings, the sharks strike from the east with the rising sun directly behind them. In the afternoons, they switch directions to approach from the west. “This would suggest that the sharks are capable of tracking the sun, which is quite an impressive feat,” says Dr. Charlie Huveneers, an ecologist who led the research. By putting the sun behind them, the sharks are avoiding glare and making their unlucky prey easier to see. 

2. Bait-fishing green herons

This beautiful bird knows the best way to catch a fish is with a little bait. They’re sometimes observed dropping bits of bait—bread, for example—into the water to lure curious victims to the surface before striking. For other herons, little fish become the bait itself, used to trick bigger fish looking for a meal. Watching a heron fish with such precision and ingenuity is a creepy reminder that birds are actually really smart.

Not to be outdone by its green cousin, the black heron has another smart tactic for finding dinner: it shapes its wings into an "umbrella" that creates shade. This allows it to see down into the water by reducing the sun’s glare, but serves the dual purpose of attracting fish, which are drawn to dark areas of vegetation. You can see this ingenious trap at work here.

3. Color-changing crab spiders

Call them the chameleons of the arachnid world. The female whitebanded crab spider can change its own color from white to yellow and back again to avoid being detected while it waits patiently on flower petals before ambushing prey. Males, sadly, aren't blessed with this talent.

4. Bubble-blowing humpback whales

These giant creatures work together to corral large schools of krill or herring into one place for a massive meal. The whales swim in an upward spiral below the fish and release columns of air bubbles, which the fish won’t swim through, essentially creating a bubble net around the prey. Researchers say this hunting skill is passed on from whale to whale.

5. Sneaky crocodiles

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Mugger crocodiles in India and some American alligators have been observed lying completely still just beneath the surface of the water for long periods of time, their snouts deliberately covered by sticks. It seems these reptiles have learned that, during heron mating season, the birds need sticks to build their nests. By hiding beneath something that’s in high demand, the crocodiles and alligators nearly guarantee themselves a meal if they can wait long enough. “If the crocodylians really are using the sticks as bait to attract their bird prey,” writes Darren Naish at Scientific American, “this is tool use, since the sticks are objects that are being employed for a specific function.”

6. The fish that plays dead

Possums aren’t the only animals that play dead. In East Africa, a species of cichlid fish uses this skill to catch smaller fish for dinner. In shallow waters, the fish sinks to the ground as if dead. Some fish spend up to 15 minutes in this position, waiting for someone to take the bait. Smaller fish, convinced by the act, nibble on the corpse of the cichlid. If they come close enough, the faking fish snaps to life and nabs a meal. But this hunting method comes with a cost: Some cichlid fish sustain lifelong injuries to their fins from essentially using their own bodies as bait.

7. Mimicking jungle cats

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Mimicry is a well-utilized and impressive skill in the animal world. One good example is the morgay, or tree ocelot, in the Amazonian forests of the Reserva Florestal Adolpho Ducke in Brazil. This jungle cat mimics the call of baby pied tamarin monkeys to attract curious adult monkeys. "Cats are known for their physical agility, but this vocal manipulation of prey species indicates a psychological cunning which merits further study," says Wildlife Conservation Society researcher Fabio Rohe.

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Big Questions
Should You Keep Your Pets Indoors During the Solar Eclipse?
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By now, you probably know what you’ll be doing on August 21, when a total solar eclipse makes its way across the continental United States. You’ve had your safety glasses ready since January (and have confirmed that they’ll actually protect your retinas), you’ve picked out the perfect vantage point in your area for the best view, and you’ve memorized Nikon’s tips for how to take pictures of this rare celestial phenomenon. Still, it feels like you’re forgetting something … and it’s probably the thing that's been right under your nose, and sitting on your lap, the whole time: your pets.

Even if you’ve never witnessed a solar eclipse, you undoubtedly know that you’re never supposed to look directly at the sun during one. But what about your four-legged family members? Shouldn’t Fido be fitted with a pair of eclipse glasses before he heads out for his daily walk? Could Princess Kitty be in danger of having her peepers singed if she’s lounging on her favorite windowsill? While, like humans, looking directly at the sun during a solar eclipse does pose the potential of doing harm to a pet’s eyes, it’s unlikely that the thought would even occur to the little ball of fluff.

“It’s no different than any other day,” Angela Speck, co-chair of the AAS National Solar Eclipse Task Force, explained during a NASA briefing in June. “On a normal day, your pets don’t try to look at the sun and therefore don’t damage their eyes, so on this day they’re not going to do it either. It is not a concern, letting them outside. All that’s happened is we’ve blocked out the sun, it’s not more dangerous. So I think that people who have pets want to think about that. I’m not going to worry about my cat.”

Dr. Jessica Vogelsang, a veterinarian, author, and founder of pawcurious, echoed Speck’s statement, but allowed that there’s no such thing as being too cautious. “It’s hard for me to criticize such a well-meaning warning, because there’s really no harm in following the advice to keep pets inside during the eclipse,” Vogelsang told Snopes. “It’s better to be too cautious than not cautious enough. But in the interest of offering a realistic risk assessment, the likelihood of a pet ruining their eyes the same way a human would during an eclipse is much lower—not because the damage would be any less were they to stare at the sun, but because, from a behavior standpoint, dogs and cats just don’t have any interest in doing so. We tend to extrapolate a lot of things from people to pets that just doesn’t bear out, and this is one of them.

“I’ve seen lots of warnings from the astronomy community and the human medical community about the theoretical dangers of pets and eclipses, but I’m not sure if any of them really know animal behavior all that well," Vogelsang continued. "It’s not like there’s a big outcry from the wildlife community to go chase down coyotes and hawks and bears and give them goggles either. While we in the veterinary community absolutely appreciate people being concerned about their pets’ wellbeing, this is a non-issue for us.”

The bigger issue, according to several experts, would be with pets who are already sensitive to Mother Nature. "If you have the sort of pet that's normally sensitive to shifts in the weather, they might be disturbed by just the whole vibe because the temperature will drop and the sky will get dark,” Melanie Monteiro, a pet safety expert and author of The Safe-Dog Handbook: A Complete Guide to Protecting Your Pooch, Indoors and Out, told TODAY.

“If [your pets] have learned some association with it getting darker, they will show that behavior or at a minimum they get confused because the timeframe does not correspond,” Dr. Carlo Siracusa of Penn Vet Hospital told CBS Philly. “You might put the blinds down, but not exactly when the dark is coming but when it is still light.” 

While Monteiro again reasserts that, "Dogs and cats don't normally look up into the sun, so you don't need to get any special eye protection for your pets,” she says that it’s never a bad idea to take some extra precautions. So if you’re headed out to an eclipse viewing party, why not do your pets a favor and leave them at home. They won’t even know what they’re missing.

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Big Questions
Why Can't Dogs Eat Chocolate?
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Even if you don’t have a dog, you probably know that they can’t eat chocolate; it’s one of the most well-known toxic substances for canines (and felines, for that matter). But just what is it about chocolate that is so toxic to dogs? Why can't dogs eat chocolate when we eat it all the time without incident?

It comes down to theobromine, a chemical in chocolate that humans can metabolize easily, but dogs cannot. “They just can’t break it down as fast as humans and so therefore, when they consume it, it can cause illness,” Mike Topper, president of the American Veterinary Medical Association, tells Mental Floss.

The toxic effects of this slow metabolization can range from a mild upset stomach to seizures, heart failure, and even death. If your dog does eat chocolate, they may get thirsty, have diarrhea, and become hyperactive and shaky. If things get really bad, that hyperactivity could turn into seizures, and they could develop an arrhythmia and have a heart attack.

While cats are even more sensitive to theobromine, they’re less likely to eat chocolate in the first place. They’re much more picky eaters, and some research has found that they can’t taste sweetness. Dogs, on the other hand, are much more likely to sit at your feet with those big, mournful eyes begging for a taste of whatever you're eating, including chocolate. (They've also been known to just swipe it off the counter when you’re not looking.)

If your dog gets a hold of your favorite candy bar, it’s best to get them to the vet within two hours. The theobromine is metabolized slowly, “therefore, if we can get it out of the stomach there will be less there to metabolize,” Topper says. Your vet might be able to induce vomiting and give your dog activated charcoal to block the absorption of the theobromine. Intravenous fluids can also help flush it out of your dog’s system before it becomes lethal.

The toxicity varies based on what kind of chocolate it is (milk chocolate has a lower dose of theobromine than dark chocolate, and baking chocolate has an especially concentrated dose), the size of your dog, and whether or not the dog has preexisting health problems, like kidney or heart issues. While any dog is going to get sick, a small, old, or unhealthy dog won't be able to handle the toxic effects as well as a large, young, healthy dog could. “A Great Dane who eats two Hershey’s kisses may not have the same [reaction] that a miniature Chihuahua that eats four Hershey’s kisses has,” Topper explains. The former might only get diarrhea, while the latter probably needs veterinary attention.

Even if you have a big dog, you shouldn’t just play it by ear, though. PetMD has a handy calculator to see just what risk levels your dog faces if he or she eats chocolate, based on the dog’s size and the amount eaten. But if your dog has already ingested chocolate, petMD shouldn’t be your go-to source. Call your vet's office, where they are already familiar with your dog’s size, age, and condition. They can give you the best advice on how toxic the dose might be and how urgent the situation is.

So if your dog eats chocolate, you’re better off paying a few hundred dollars at the vet to make your dog puke than waiting until it’s too late.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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