Scientists Discover 'Octlantis,' a Bustling Octopus City

Sylke Rohrlach, Wikimedia Commons // CC BY-SA 4.0
Sylke Rohrlach, Wikimedia Commons // CC BY-SA 4.0

Octopuses are insanely talented: They’ve been observed building forts, playing games, and even walking on dry land. But one area where the cephalopods come up short is in the social department. At least that’s what marine biologists used to believe. Now a newly discovered underwater community, dubbed Octlantis, is prompting scientists to call their characterization of octopuses as loners into question.

As Quartz reports, the so-called octopus city is located in Jervis Bay off Australia’s east coast. The patch of seafloor is populated by as many as 15 gloomy octopuses, a.k.a. common Sydney octopuses (octopus tetricus). Previous observations of the creatures led scientists to think they were strictly solitary, not counting their yearly mating rituals. But in Octlantis, octopuses communicate by changing colors, evict each other from dens, and live side by side. In addition to interacting with their neighbors, the gloomy octopuses have helped build the infrastructure of the city itself. On top of the rock formation they call home, they’ve stored mounds of clam and scallop shells and shaped them into shelters.

There is one other known gloomy octopus community similar to this one, and it may help scientists understand how and why they form. The original site, called Octopolis, was discovered in the same bay in 2009. Unlike Octlantis, Octopolis was centered around a manmade object that had sunk to the seabed and provided dens for up to 16 octopuses at a time. The researchers studying it had assumed it was a freak occurrence. But this new city, built around a natural habitat, shows that gloomy octopuses in the area may be evolving to be more social.

If that's the case, it's unclear why such octo-cities are so uncommon. "Relative to the more typical solitary life, the costs and benefits of living in aggregations and investing in interactions remain to be documented," the researchers who discovered the group wrote in a paper published in Marine and Freshwater Behavior and Physiology [PDF].

It’s also possible that for the first time in history humans have the resources to see octopus villages that perhaps have always been bustling beneath the sea surface.

[h/t Quartz]

For the First Time Ever, a Mammal Has Been Declared Extinct Due to Climate Change

The Whitsunday Islands in Australia's Great Barrier Reef
The Whitsunday Islands in Australia's Great Barrier Reef
iStock.com/4FR

An Australian rat-like rodent called the Bramble Cay melomys is the first known mammal wiped out by manmade climate change, The Hill reports. The now-extinct animal (Melomys rubicola) lived on the tiny, uninhabited island of Bramble Cay in the Great Barrier Reef. Despite exhaustive efforts to track down the melomys over seven years, no signs of the rodent could be found, and in 2016, Queensland’s state government declared the animal extinct.

These fears were confirmed when news broke this week that the national government had quietly changed the rodent’s classification from endangered to extinct. Meanwhile, the status of a fruit bat called the spectacled flying-fox was changed from vulnerable to endangered after a recent heatwave in north Queensland, which dealt another blow to a population that had already been cut in half over the last decade.

As for the Bramble Cay melomys, its demise can be attributed to rising sea levels, storm surges, and other weather events that have worsened due to climate change. According to The Revelator, the tides destroyed about 97 percent of the island’s vegetation, which was the rodent’s only food source.

Leeanne Enoch, Queensland's Minister for Environment and the Great Barrier Reef, told The Sydney Morning Herald that the latest animal extinction is evidence “we are living the real effects of climate change right now.”

In a 2018 study commissioned by the World Wildlife Fund, researchers found that up to half of the 80,000 plant and animal species that reside in 35 of the world’s most diverse areas could become extinct by the turn of the century because of climate change.

For some species, it’s already too late. A Hawaiian bird called the poo-uli (or black-faced honeycreeper) was declared extinct last year, largely due to diseases carried by mosquitoes, which thrive in warmer climates. For other endangered species in the U.S.—like the black-footed ferret, red wolf, and rusty patched bumble bee—there might still be time to step in and protect them.

[h/t The Hill]

A Fort Hood Mule With 12 Years of Army Experience Is Looking for a Forever Home

iStock.com/PamWalker68
iStock.com/PamWalker68

Attention, animal lovers: A mule in Fort Hood, Texas with more than a decade of U.S. Army experience is up for adoption. Tina the Army mule has been a part of the Fort Hood military base's 1st Cavalry Division Horse Detachment for most of her life, and now KWTX reports that she needs a place to spend her retirement.

Foaled in 1999, the Fort Hood 1st Cavalry adopted Tina in 2006. Since then, she has assisted in parades, weapons demonstrations, cavalry charges, and color guards for the division. She has experience pulling an M1878 Escort wagon in a harness as well as standing by calmly for ceremonies.

She worked as a draft mule until 2018, and now that she's retiring, Fort Hood officials are looking to find her a forever home. Tina has no health problems or dietary restrictions and enjoys eating Coastal Bermuda hay and pasture grass. Her sister Dolly, who died of bone cancer in 2018, was the only mule she's ever been paired with. Though Tina can perform light solo work, her new owners should be cautious about pairing her with another mule.

If you're interested in making Tina a part of your family, Fort Hood would like to hear from you. You can contact the current owners by emailing your request along with any questions to 1CDHorseCavalryDetachment@gmail.com by March 7. Once your inquiry is received, you'll be sent an application packet with instructions on how to proceed.

[h/t KWTX]

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