If you ever visit Southeast Asia, you might come across the whitest thing you’ve ever seen.
And it’s not this guy:
It’s the Cyphochilus beetle, a beetle whose shell is whiter than even the whitest paper, the whitest snow, even the whitest paint.
In fact, it’s brighter than anything that human technology could create using a material as thin as the beetle does.
So what is this material? Well, it’s called chitin.
Chitin is similar to the cellulose, the main material in a plant’s cell wall. It forms complex, tightly-knit networks of filaments that build the shells of crustaceans and the exoskeletons of many insects.
But on it’s own, chitin is not a very good reflector of light at all, so researchers at the University of Cambridge and the European Laboratory for Non-linear Spectroscopy in Italy came together to try to uncover the secret behind the Cyphocilus beetle’s extraordinary brilliance.
What they found was that it was not the material itself that made the beetles look so white, but the geometric pattern in which the chitin filaments had arranged themselves.
The colors we perceive come from the ways in which different colors of light reflect off of different materials.
However, the structure of the beetle’s shell reflects light anisotropically. This means that all the different colors of light get reflected in the same direction, which is why the shell appears to be such a brilliant white (mixing all of the colors of light gives you white light).
But unlike man-made reflectors, which tend to be fairly thick, the beetle’s individual scales are only thousandths of a millimeter thick. This keeps them light, minimizing the amount of energy the beetle has to expend while flying.
When you think of strength in the animal kingdom, it’s natural to think of some of the massive majestic creatures we’re all so familiar with: lions, elephant, grizzlies, rhinos, hippos…
These animals are definitely powerful, but when you examine pound-for-pound strength, you quickly realize that it’s the smallest creatures who are really the most impressive lifters.
Take the leafcutter ant, for instance. These ants cut off and carry leaf segments that are sometimes up to 50 times heavier than they are.
But even the leafcutter ant is no match for the dung beetle when it comes to true strength.
Though their appetite for dung has given them a bit of a bad name in our society today, dung beetles (also known as scarabs) were actually worshipped in ancient Egypt.
The ancient Egyptians believed that the sun was rolled across the sky every day by a giant scarab god.
Dung beetles may not actually be gods, but they definitely have superhuman strength. The insects are able to drag dung balls up to 1,140 times their body weight- the equivalent of an average human pulling six double deckers buses full of passengers.
But there’s more to dung beetles than just eating poop.
For example, they’re actually pretty good parents. Dung beetles are one of only a few groups of insects that has been shown to actively care for their offspring. There is even a monogamous species of dung beetle that mates for life.
Even more interesting is the dung beetle’s navigation system. After rolling a fresh poop ball, the beetles will climb on top of it and dance around, orienting itself.
Scientists theorized that the beetles were actually using the Milky Way to orient themselves and navigate.
They tested this theory on one species of African dung beetle by putting little hats over them that covered their eyes.
The beetles still perched atop their poop balls to try and orient themselves, but only were able to wander around aimlessly without being able to see the stars, proving that they were using the heavens to navigate.
So give the dung beetle some credit- they’re probably much more intelligent and complex than you ever imagined.
Villagers from a village in the Sichuan province of China just collected the largest ever aquatic insect specimen.
The bug, a massive dobsonfly, has a wingspan of more than 8 inches. The previous record-holder for the world’s largest aquatic insect was a South American helicopter damselfly, which had a wingspan of 7.5 inches.
Though dobsonflies are relatively common (there are over 200 species across Asia, Africa and South America), one of this size had been unheard of until now.
Looking at a dobsonfly can actually be very misleading. For one, those massive, grisly-looking mandibles protruding from its head are actually only used for mating. Males flaunt them to impress the females and hold them in place during the actual mating process.
Also, those massive wings are pretty much all for show. The insect almost never flies, preferring to spend the bulk of its time in the water (both underwater and on the surface), or sheltering underneath rocks.
Dobsonflies are also a biological indicator of water quality. They prefer clean water with very low levels of pollution and a relatively neutral pH. If water quality falls below their standards, they will leave and find a new body of water to call home.
The villagers gave the record-setting specimen to the Insect Museum of West China.
Meet the trap-jaw ant. This gnarly family of ants has massive mandibles which can open up to 180 degrees. These jaws are coated in tiny, extremely sensitive hairs, which allow the ants to snap their jaws closed faster than their brains can even process the movement (some claim they are the fastest jaws in the world).
These formidable ants have another amazing (but rather scary) ability: when threatened, they snap their powerful jaws against the ground, creating a massive amount of force which shoots them upwards like a piece of popcorn.
With painful stingers attached to their abdomens, being surrounded by a bunch of these jumping ants could be a very unpleasant experience.
“They look like little hammerhead sharks walking around,”
said D. Magdalena Sorger, a scientist who has been studying these insects as part of her PhD research at North Carolina State University.
There are four species of trap-jaw ants native to the U.S., but Sorger’s research has focused on a particularly aggressive species of trap-jaw ants that originated in South America.
This invasive species of trap-jaw ant, known as Odontomachus haematodus, has actually been living in the States for around 50 years now, but studies have shown that the ant has been rapidly spreading along the Gulf Coast in recent years.
Why are they only spreading now? Sorger isn’t sure yet, but suggests that they were either building up their numbers before spreading, or that changes in climate have allowed them to inhabit a wider range.
So, should we be worried about a trap-jaw ant takeover? That’s pretty unlikely, according to invasive ant specialist Andrew Suarez. He points out that unlike other invasive ants (like fire ants, for example), these South American trap-jaw ants,
”don’t have colonies with tens to hundreds of thousands of workers that can overwhelm the local fauna.”
He does point out that their sting is particularly painful however, and that some people may be allergic to the venom.
Read the original story from National Geographic here.
Professor Daniel Janzen, a biology professor from the University of Pennsylvania, has spent years of his life cataloguing and photographing a very unique group of creatures: caterpillars that defend themselves against predators by looking and acting like snakes.
Check out some more pictures of “Snake Caterpillars” taken by Professor Janzen below:
Snake caterpillars can be found in Costa Rica, Guatemala, Belize, and some parts of Mexico. Their markings resemble a snake’s head, which they can actually use to “strike” at would be predators (though they obviously can’t bite like a real snake would).
Janzen is an ecologist and what most would call a caterpillar expert. He’s been tracking these insects in Costa Rica since 1978 and has been an expert in the field of entomology (the study of insects) for 50 years.
He splits his time between his labs and the field, spending half the year at the University and the other half in Central America, searching for strange new species of insect like the snake caterpillars.
Janzen took most of the photos shown above just last month while cataloguing caterpillars like the snake caterpillar in the Area de Conservacion Guanacaste in Costa Rica.
This snake mimicry is exhibited in a number of caterpillars from the hemeroplanes genus of moths. The green colored caterpillar above becomes the Hemeroplanes triptolemus after completing its pupal stage.
Another species of caterpillar with the ability to mimic snakes emerges as the vibrantly colored elephant-hawk moth (Deilephila elpenor), pictured below (click an image to enlarge).
Jacobina is a small farming town in the eastern Brazilian state of Bahia. Like in many other places in Brazil, Jacobina is plagued by dengue fever The most serious form of the disease, known as dengue hemorrhagic fever, can cause shock, comas and death. The disease is primarily carried by the Aedies aegypti species of mosquito and is one of the leading causes of illness and death in Brazil.
The people of Jacobina had tried out all sorts of different strategies to combat the disease-carrying mosquitos with little success. Methods like air fumigation and putting larvicides in the water were ineffective because the mosquitos tend to live and breed inside homes, and are able to build up a resistance to the insecticides.
Mosquito nets put over beds had little impact because the mosquitos that carry the disease only bite during the day, and public education campaigns urging citizens to wear long sleeves and use repellent mostly fell upon deaf ears.
So Aldo Malavasi, president of Moscamed, decided to try out a bold, mostly untested strategy. He and his team worked with mosquitos genetically modified with a lethal gene (the mosquitos are kept alive in the lab using the antibiotic tetracycline). This method for genetically modifying mosquitos originated with Oxitec, a company which describes itself as an “innovative insect controller”.
The modified mosquito, known as the OX513-A, is the first ever genetically modified insect to be released into the wild- they were initially tested in 2010 in the Cayman Islands and Malaysia, but only in small numbers.
Once Moscamed’s collection of genetically modified mosquitos reached larval state, Malavasi and his team extracted all the males (who don’t bite) and destroyed the females.
Twice a week, Moscamed workers hop in trucks and drive around releasing the genetically-altered males, who then mate with females, passing on the lethal gene which kills the offspring since they have no access to the antibiotic.
There have been some concerns raised though. Among these is the worry that a decline in Aedies mosquitos will simply lead to an increase in the population of Asian tiger mosquitos, which also live in the area. Malavasi points out, however, that tiger mosquitos are much less efficient in terms of spreading dengue fever.
Some critics of genetic modification also raise concerns that a few female mosquitos will inevitably end up getting released with the males, and worry about the consequences of one of them biting a human. Malavasi also dismisses this worry, saying that it’s highly unlikely that the female mosquitos would come into contact with the antibiotic tetracycline in just the right doses for them to survive after release.
Malavasi also stresses that field tests in isolated towns like Jacobina are what give us the answers to many of our questions and concerns, adding,
“We need to provide alternatives because the system we have now in Brazil doesn’t work.”
The people of Jacobina, tormented by dengue fever for years, are all for the plan, and Moscamed does a good job of remaining transparent. They hold regular public meetings with local health officials to answer questions and have passed out literature about the project to the people of Jacobina.
Moscamed has reported a 90% decrease in the population of the Aedies mosquito thus far.
Meet the issus planthopper, a close relative of the grasshopper.
In September of last year, scientists studying this insect discovered that the issus was using a built-in mechanical gear to synchronize the powerful jumping mechanisms that it uses to jump distances over 100 times its body-length. Here’s a close up:
It’s the first mechanical gear found within a living creature, and helps the planthopper achieve jumping accelerations up to 400g’s (ie. 400x the force of gravity), 20 times what the human body can withstand.
Here’s a video showing the mechanism in action. It has been slowed waaaay down- the actual process happens in less than 30 milliseconds: