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Mosquitoes Get Bug Bites, Too

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At the moment, I have six mosquito bites on my right forearm, another one further up on my bicep, another one on my other forearm and two on my left calf. I’m a little itchy, to say the least, but my annoyance is tempered from knowing there’s a little bit of karmic justice in the natural world. Turns out, mosquitoes have their own bloodsucking pest that they have to deal with, a parasitic midge known as Culicoides anopheles.

At Parasite of the Day, Sarah Prammer has the details on a new study in which researchers in China were able to get close-up video footage of one of these midges feeding from a mosquito:

“This particular study took place last year (2013) in Haikou, a populous city in Hainan. An unfortunate cow was used as bait inside a net trap to capture mosquitoes. Upon examining the caught mosquitoes, the researchers noticed that one of them, an Anopheles sinensis specimen, was being parasitised by the midge. This happened again the next day. The researchers chloroformed the animals and videotaped their behaviour underneath a microscope. The midge had pierced the front of the mosquito’s abdomen with a specialised tube-like mouthpart called a proboscis, and its own abdomen increased in size as it stole the stolen blood directly from the mosquito. It was significantly smaller than the host which probably gave it easier access and prevent the mosquito from pulling it off.”

In the video, you’ll notice that the midge seems to struggle a bit to detach, and moves its body into a different position before pulling its face away. The researchers think that it was having a hard time unplugging its proboscis, which attaches securely to the host’s body so that the midge can hang on to and eat from a mosquito, even while it’s flying, for as long as two days. At least mosquitoes don’t do that to us! It almost makes me feel bad for them ... at least until I start itching again. 

Tommy Leung

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Animals
How Bats Protect Rare Books at This Portuguese Library
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Visit the Joanina Library at the University of Coimbra in Portugal at night and you might think the building has a bat problem. It's true that common pipistrelle bats live there, occupying the space behind the bookshelves by day and swooping beneath the arched ceilings and in and out of windows once the sun goes down, but they're not a problem. As Smithsonian reports, the bats play a vital role in preserving the institution's manuscripts, so librarians are in no hurry to get rid of them.

The bats that live in the library don't damage the books and, because they're nocturnal, they usually don't bother the human guests. The much bigger danger to the collection is the insect population. Many bug species are known to gnaw on paper, which could be disastrous for the library's rare items that date from before the 19th century. The bats act as a natural form of pest control: At night, they feast on the insects that would otherwise feast on library books.

The Joanina Library is famous for being one of the most architecturally stunning libraries on earth. It was constructed before 1725, but when exactly the bats arrived is unknown. Librarians can say for sure they've been flapping around the halls since at least the 1800s.

Though bats have no reason to go after the materials, there is one threat they pose to the interior: falling feces. Librarians protect against this by covering their 18th-century tables with fabric made from animal skin at night and cleaning the floors of guano every morning.

[h/t Smithsonian]

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Honey Bees Can Understand the Concept of Zero
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The concept of zero—less than one, nothing, nada—is deceptively complex. The first placeholder zero dates back to around 300 BCE, and the notion didn’t make its way to Western Europe until the 12th century. It takes children until preschool to wrap their brains around the concept. But scientists in Australia recently discovered a new animal capable of understanding zero: the honey bee. According to Vox, a new study finds that the insects can be taught the concept of nothing.

A few other animals can understand zero, according to current research. Dolphins, parrots, and monkeys can all understand the difference between something and nothing, but honey bees are the first insects proven to be able to do it.

The new study, published in the journal Science, finds that honey bees can rank quantities based on “greater than” and “less than,” and can understand that nothing is less than one.

Left: A photo of a bee choosing between images with black dots on them. Right: an illustration of a bee choosing the image with fewer dots
© Scarlett Howard & Aurore Avarguès-Weber

The researchers trained bees to identify images in the lab that showed the fewest number of elements (in this case, dots). If they chose the image with the fewest circles from a set, they received sweetened water, whereas if they chose another image, they received bitter quinine.

Once the insects got that concept down, the researchers introduced another challenge: The bees had to choose between a blank image and one with dots on it. More than 60 percent of the time, the insects were successfully able to extrapolate that if they needed to choose the fewest dots between an image with a few dots and an image with no dots at all, no dots was the correct answer. They could grasp the concept that nothing can still be a numerical quantity.

It’s not entirely surprising that bees are capable of such feats of intelligence. We already know that they can count, teach each other skills, communicate via the “waggle dance,” and think abstractly. This is just more evidence that bees are strikingly intelligent creatures, despite the fact that their insect brains look nothing like our own.

Considering how far apart bees and primates are on the evolutionary tree, and how different their brains are from ours—they have fewer than 1 million neurons, while we have about 86 billion—this finding raises a lot of new questions about the neural basis of understanding numbers, and will no doubt lead to further research on how the brain processes concepts like zero.

[h/t Vox]

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