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University of Canterbury

Meet the Vampire Spider

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University of Canterbury

Evarcha culicivora is a tiny spider that lives around Lake Victoria in East Africa, and it has a taste for blood. Don’t worry about one biting you like Dracula on eight legs, though. The spider doesn’t have the piercing mouthparts to get through your skin and into your veins. Instead, it goes about vampirism in a more roundabout way.

With its acute eyesight and smell and the ability to leap several feet, the spider is an excellent bug stalker. Given a choice of prey in laboratory experiments, E. culicivora shows a clear preference for female mosquitoes that have recently fed on mammal blood, and can even sniff out these blood-filled skeeters without even seeing them. It’s the only animal scientists know of that chooses its prey based on the prey’s own meals. 

Going through a middleman saves the spiders a lot of trouble in their hunt for blood. Even if it had the right anatomical equipment for feeding directly on humans or other large animals, doing so could get it swatted or squashed. Hunting mosquitoes is much less risky.  

The spiders’ indirect vampirism could be good for humans, too. They selectively target mosquitoes from the genus Anopeheles, one of the main vectors for malaria. The spiders can be as picky as they are because their sharp eyes allow them to distinguish different mosquito species based on posture, and different sexes based on the shape of the insects’ antennae.

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Animals
Plagued with Rodents, Members of the UK Parliament Demand a Cat
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iStock

Members of the United Kingdom’s Parliament want a cat, but not just for office cuddles: As The Telegraph reports, the Palace of Westminster—the meeting place of Parliament’s two houses, the House of Commons and the House of Lords—is overrun with vermin, and officials have had enough. They think an in-house feline would keep the rodents at bay and defray skyrocketing pest control costs.

Taxpayers in the UK recently had to bear the brunt of a $167,000 pest control bill after palace maintenance projects and office renovations disturbed mice and moths from their slumber. The bill—which was nearly one-third higher than the previous year’s—covered the cost of a full-time pest control technician and 1700 bait stations. That said, some Members of Parliament (MPs) think their problem could be solved the old-fashioned way: by deploying a talented mouser.

MP Penny Mordaunt tried taking matters into her own hands by bringing four cats—including her own pet kitty, Titania—to work. (“A great believer in credible deterrence, I’m applying the principle to the lower ministerial corridor mouse problem,” she tweeted.) This solution didn’t last long, however, as health and safety officials banned the cats from Parliament.

While cats aren’t allowed in Parliament, other government offices reportedly have in-house felines. And now, MPs—who are sick of mice getting into their food, running across desks, and scurrying around in the tearoom—are petitioning for the same luxury.

"This is so UNFAIR,” MP Stella Creasy said recently, according to The Telegraph. “When does Parliament get its own cats? We’ve got loads of mice (and some rats!) after all!" Plus, Creasy points out, a cat in Parliament is “YouTube gold in waiting!"

Animal charity Battersea Dogs & Cats Home wants to help, and says it’s been trying to convince Parliament to adopt a cat since 2014. "Battersea has over 130 years [experience] in re-homing rescue cats, and was the first choice for Downing Street, the Foreign and Commonwealth Office, and the Cabinet Office when they sought our mousers to help with their own rogue rodents,” charity head Lindsey Quinlan said in a statement quoted by The Telegraph. “We'd be more than happy to help the Houses of Parliament recruit their own chief mousers to eliminate their pest problem and restore order in the historic corridors of power."

As of now, only assistance and security dogs are allowed on palace premises—but considering that MPs spotted 217 mice alone in the first six months of 2017 alone, top brass may have to reconsider their rules and give elected officials purr-mission to get their own feline office companions.

[h/t The Telegraph]

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Gray, George Robert; Hullmandel & Walton; Hullmandel, Charles Joseph; Mitchell, D. W / Public Doman
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DNA Tests Show ‘Extinct’ Penguin Species Never Existed
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Gray, George Robert; Hullmandel & Walton; Hullmandel, Charles Joseph; Mitchell, D. W / Public Doman

Science is a self-correcting process, ever in flux. Accepted hypotheses are overturned in the face of new information. The world isn’t flat after all. Disease isn’t caused by demons or wickedness. And that Hunter Island penguin? Yeah, apparently that was just a figment of our imaginations. Researchers writing in the Zoological Journal of the Linnean Society say the remains of one supposed species are in fact a “jumbled mixture” of bones from three extant species.

The bones were unearthed in the 1980s during the excavation of a prehistoric trash heap on Tasmania’s Hunter Island. Two scientists named Tets and O’Connor argued that the remains were different enough from other penguins to constitute their own genus and species, one which must have died out during the Holocene epoch. The proud potential penguin parents dubbed the apparently extinct bird Tasidyptes hunterivan, and that was that.

Except that this is science, where no story is ever really over. Other biologists were not satisfied with the evidence Tets and O’Connor presented. There were only four bones, and they all bore some resemblance to species that exist today. Fortunately, in 2017, we’ve got ways of making fossils talk. A research team led by Tess Cole of the University of Otago used DNA barcoding to examine the genetic code of each of the four bones.

“It was a fun and unexpected story,” Cole said in a statement, “because we show that Tasmania’s ‘extinct' penguin is not actually an extinct or unique penguin at all.”

Snares penguins dive into the water.
Snares penguins (Eudyptes robustus).
Brocken Inaglory, Wikimedia Commons // CC BY-SA 3.0

The bones were “a jumbled mixture of three living penguin species, from two genera": the Fiordland crested penguin or Tawaki (Eudyptes pachyrhynchus) and the Snares crested penguin (Eudyptes robustus), both of New Zealand, and the Australian little fairy penguin (Eudyptula novaehollandiae).

“This study shows how useful ancient DNA testing can be,” Cole said. “Not only does it help us identify new but extinct species, but it can help us rule out previously postulated species which did not exist, as in this case.”

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