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US NewsGiant tiger sharks eat backyard birds, surprising study reveals

02:55  22 may  2019
02:55  22 may  2019 Source:   nationalgeographic.com

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Dr. Marcus Drymon from the University of South Alabama and Dauphin Island Sea Lab wants to find out how Tiger Sharks are making a meal of backyard song birds . Ultimately, a better understanding of the tiger shark ’s diet will aid in the formatting of a more effective conservation and management plan.

Tiger sharks are known to eat almost anything they can, including dolphins, sea turtles and even humans. The latest study from a team at Study lead author Dr Marcus Drymon, of Mississippi State University, and his colleagues investigated juvenile tiger sharks ' diets by wrestling them onto a boat

Giant tiger sharks eat backyard birds, surprising study reveals © Photograph by Brian J. Skerry, Nat Geo Image Collection

A tiger shark swims off the Bahamas. The predators are consummate scavengers, with excellent senses of sight and smell.

Tiger sharks are among the most imposing predators of tropical seas. Reaching lengths of 15 feet or more, the beastly fish also have voracious appetites, devouring everything from sea turtles to rubber tires.

Now, new research suggests that baby tiger sharks have an even weirder item on their menu: common backyard birds.

Study leader Marcus Drymon stumbled upon the discovery in 2010, when he caught a small tiger shark as part of an ongoing research project in the Gulf of Mexico.

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Tiger sharks have a reputation for being the 'garbage cans of the sea' -- they'll eat just about anything, from dolphins and sea turtles to rubber tires. And in a new study , scientists just discovered that baby tiger sharks eat birds . And not seabirds like gulls or pelicans -- familiar backyard birds like

“We brought it onto the boat to get ready to measure it, weigh it, tag it, and release it, and it barfed up this big [mass] of feathers,” says Drymon, a marine fisheries researcher at Mississippi State University.

Giant tiger sharks eat backyard birds, surprising study reveals © Photograph by Joel Sartore, Nat Geo Image Collection

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“Being a scientist, of course, I scooped them all up and took them back to the lab to analyze.” (Read about what it's like to go face-to-face with a tiger shark.)

It turned out the feathers belonged to a brown thrasher, not one of the many seabirds—such as gulls, pelicans, or cormorants—that tiger sharks regularly eat.

Other scientists had reported tiger sharks eating terrestrial birds before, but these were anecdotal, one-off occurrences. The new study, published May 21 in the journal Ecology, is the first confirmed evidence of tiger sharks regularly eating terrestrial birds.

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Thanks to a new tiger shark study conducted by scientists at Florida’s Nova Southeastern University, some groundbreaking information about the species is now being Long thought to be a coastal species, the tiger shark ’s travels show that their migratory patterns are more akin to birds and turtles.

Chasing sharks

After that initial discovery, Drymon and colleagues decided to investigate tiger shark diets as part of their project.

Giant tiger sharks eat backyard birds, surprising study reveals © Photograph by George Grall, Nat Geo Image Collection

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When the scientists caught tiger sharks that were small enough to wrestle on board and handle, they’d perform a “gastric lavage” by placing a PVC pipe in the shark’s mouth, putting a hose down the pipe, and rinsing the stomach contents out into a sieve to be catalogued. The shark—often a newborn only three feet long—was released afterward, unharmed. (Learn more about sharks, lords of the sea.)

Over eight years, out of 105 sharks studied, 41 had partially digested bird remains in their guts. When the team identified the remains using DNA analysis, they found that they all came from 11 species of North American land birds.

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Tiger sharks will eat almost anything, such as stingrays, birds , sea snakes and seals, as they are scavengers in the ocean and are equipped with serrated razor-sharp teeth that enable them to break sea turtle shells as well as clams. The tiger shark also has a reputation as a maneater because it is

Birds on the move

Bizarrely, most of them, like swamp sparrows and marsh wrens, were passerines—the chirping songbirds that you might see at your bird feeder.

But how did scores of avian landlubbers find their way to such salty doom? Drymon and his colleagues used data from the citizen science project eBird to find the seasonal timing of when the birds in the study were most abundant off Mississippi and Alabama. Remarkably, each species showed up in shark bellies right around the time its local prevalence peaked. (Learn more about tiger sharks.)

Giant tiger sharks eat backyard birds, surprising study reveals © Photograph by Bill Curtsinger, Nat Geo Image Collection

A shark threatens a fledgling albatross on French Frigate Shoals in Hawaii.

“It's a strong suggestion that this phenomenon is linked to [songbird] migration,” says Drymon.

Since most of the songbirds were eaten in the fall, Drymon thinks the birds may be getting struck down to the ocean’s surface by severe and unpredictable autumnal storms as they leave for southern latitudes, making them easy prey for the sharks.

It also seems as though the sharks have noticed the seasonal glut of feathered calories, since Drymon’s team found juvenile tiger shark abundance in the area is three times higher between August and November. Such food-motivated aggregations of tiger sharks are seen elsewhere, such as at French Frigate Shoals in Hawaii, where the predators feed on fledgling albatross. (See gorgeous photos of sharks.)

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Since this shark preys on almost anything, it has a diverse diet and includes dolphins (spotted, common and bottlenose dolphins), octopus, sea snakes, spiny lobsters, and many more creatures. Let's find out about the diet of the tiger sharks in What do Tiger Sharks Eat ?

The tiger shark is one of the shark species most likely to attack a human unprovoked, and is considered one of the most dangerous sharks in the world for that reason. Tiger sharks are one of the "Big Three" aggressive shark species, along with great white sharks and bull sharks .

Baby food?

“But what makes our situation even more interesting is that the vast majority of these individuals are newborn tiger sharks,” says Drymon.

It’s even possible that tiger shark mothers birth their pups in the northern Gulf because the young can capitalize on the seasonal songbird scavenging opportunities.

Samantha Munroe, a marine biologist at the University of Adelaide in Australia, says by email that the study “helps change our perception about the connectivity between land and marine species.” (Read about threats to songbirds.)

It also “provides a great jumping-off point for a myriad of other interesting research questions,” says Munroe, who was not involved with the study.

For instance, are songbirds more nutritious than other prey? “Future studies assessing the energy or nutritional value of terrestrial birds as compared to other types of prey," she says, "would also help clarify how important songbirds are to tiger shark diet and survival.”

Gallery: The best underwater photos of the year reveal shipwrecks, sharks, and terrifying deep-sea creatures (Business Insider)

Giant tiger sharks eat backyard birds, surprising study reveals

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