Very Polite Canadian Belugas Have Made Friends With a Lone Narwhal

Baleines En Direct, YouTube
Baleines En Direct, YouTube

It’s hard to resist the cute factor of cross-species friendship. And so it’s with great joy that we report that Canada’s beluga whales appear to be just as polite as the rest of their countrymen when it comes to making friends with other species. One pod of belugas seems to have adopted a stray narwhal, according to the CBC.

The narwhal, captured in drone footage taken by researchers from the Canadian marine conservation nonprofit GREMM, has been spotted three years in a row swimming closely with a pod of young, mostly male beluga whales in the St. Lawrence estuary in Québec. The narwhal seems to exhibit beluga behaviors like blowing bubbles, and acts playful with the rest of the group. The same whale was spotted swimming with belugas in the area in 2016 and 2017, according to photo comparisons.

The sighting is notable because it took place more than 600 miles south of normal narwhal territory. The Arctic whales typically don’t venture farther south than Ungava Bay, located at the northern edge of Québec east of Hudson Bay.

In a post on GREMM’s site Whales Online, the researchers behind the footage speculate that climate change might make these sights more regular. The beluga and the narwhal both belong to the same cetacean family, Monodontidae, and as the waters in the Arctic warm, the two species’ territories might start to overlap more frequently. This could eventually lead to whale hybrids, even, similar to how shrinking sea ice has brought polar bears and grizzlies together more often, leading to interbreeding. This narwhal may have strayed far from his normal territory, losing track of his own kind before taking up with this band of friendly young whales.

[h/t CBC]

Some Fish Eggs Can Hatch After Being Pooped Out by Swans

iStock/olaser
iStock/olaser

A question that’s often baffled scientists is how certain species of fish can sometimes appear—and even proliferate—in isolated bodies of water not previously known to harbor them. A new study has demonstrated that the most unlikely explanation might actually be correct: It’s possible they fell from the sky.

Specifically, from the rear end of a swan.

A study in the journal Ecology by researchers at the Unisinos University in Brazil found that killifish eggs can, in rare cases, survive being swallowed by swans, enduring a journey through their digestive tracts before being excreted out. This kind of fecal public transportation system explains how killifish can pop up in ponds, flood waters, and other water bodies that would seem an unlikely place for species to suddenly appear.

After discovering that some plants could survive being ingested and then flourish in swan poop, researchers took notice of a killifish egg present in a frozen fecal sample. They set about mixing two species of killifish eggs into the food supply of coscoroba swans living in a zoo. After waiting a day, they collected the poop and dug in looking for the eggs.

Of the 650 eggs they estimated to have been ingested by the swans, about five were left intact. Of those, three continued to develop. Two died of a fungal infection, but one survived, enduring 30 hours in the gut and hatching 49 days after being excreted.

Because killifish eggs have a thick outer membrane, or chorion, they stand a chance of coming through the digestive tract of an animal intact. Not all of what a swan ingests will be absorbed; their stomachs are built to extract nutrients quickly and get rid of the whatever's left so the birds can eat again. In rare cases, that can mean an egg that can go on to prosper.

Not all fish eggs are so durable, and not all fish are quite like the killifish. Dubbed the "most extreme" fish on Earth by the BBC, killifish have adapted to popping up in strange environments where water may eventually dry up. They typically live for a year and deposit eggs that can survive in soil, delaying their development until conditions—say, not being inside a swan—are optimal. One species, the mangrove killifish, can even breathe through its skin. When water recedes, they can survive on land for over two months, waddling on their bellies or using their tails to "jump" and eat insects. A fish that can survive on dry land probably doesn't sweat having to live in poop.

The researchers plan to study carp eggs next to see if they, too, can go through a lot of crap to get to where they’re going.

[h/t The New York Times]

31 Facts About Sharks

Simba, the world's most adorable Pomeranian, hosts The List Show. Some enamored human being helps … we think her name is Erin McCarthy.
Simba, the world's most adorable Pomeranian, hosts The List Show. Some enamored human being helps … we think her name is Erin McCarthy.

Sharks are some of the world's most intimidating creatures, right down to their species names. There’s the hammerhead shark, the great white shark, the bull shark—but did you know there’s also a cookiecutter shark? Don’t be fooled by its name, though: Mental Floss editor-in-chief Erin McCarthy says that the cookiecutter shark often preys on animals many times its size, and isn’t afraid to take a chunk out of a human. (And how they take a bite out of something is even more terrifying/fascinating.)

In this week’s edition of The List Show, Erin gives the lowdown on 31 amazing shark-related facts, including details on some Icelandic delicacies that even Anthony Bourdain found disgusting to trivia about Peter Benchley's Jaws.

You can watch the full episode—and catch Erin doing her best Tom Jones impression—below.

For more episodes like this one, be sure to subscribe here.

SECTIONS

arrow
LIVE SMARTER