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Tiger shark vomits echidna, shocking Australian scientists

By AFP

June 6, 2024 09:30 AM


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A tiger shark has surprised Australian scientists on an ocean research trip by regurgitating a spiky land-loving echidna in front of them.

Researchers from James Cook University were tagging marine life on the northeast coast when the three-metre tiger shark they caught vomited a dead echidna -- a spiny creature similar to a hedgehog.

Nicolas Lubitz said he could only assume the shark gobbled up the echidna while it was swimming in the shallows off the island, or travelling between islands, which the animals are known to do.

"We were quite shocked at what we saw. We really didn't know what was going on," he said Thursday.

"When it spat it out, I looked at it and remarked 'What the hell is that?'"

Lubitz said the dead echidna was whole when it was regurgitated in May 2022, leading scientists to assume the shark had only recently eaten it.

Echidnas -- which are only found in Australia and New Guinea -- are egg-laying mammals, have spines protruding from their bodies and use a beak-like snout to eat ants.

It is unclear how many of these animals are in the wild, but they are not considered endangered.

"Tiger sharks will eat anything. They're just a scavenger. I've seen videos of them eating a rock for no reason," Lubitz said.

"I think the echidna must have just felt a bit funny in its throat."

The tiger shark was unharmed after its spiky snack and scientists fitted it with an acoustic tracker before releasing it back into the water.

As part of the research project, which ran from 2020 to 2023, scientists tagged 812 fish, rays and sharks with 10-year trackers to understand more about their movement and behaviour.


AFP


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