Chimpanzees keep cleaner beds than humans because, unlike their evolutionary relatives, they “make their own beds daily,” a new study released Tuesday said.

Researchers from North Carolina State University earlier hypothesized a greater number of bacteria would be present in chimp nests compared to human mattresses and sheets because of the outdoor environment – but that wasn't the case, the study found.

Researchers swabbed 41 chimpanzee nests in Tanzania and found almost none of the microbes found in human beds, such as fecal microbes, the report said.

“Our data would suggest that they're really quite good at grooming each other and cleaning off ectoparasites,” Megan Thoemmes, lead author of the paper, Told the Washington Post. The Ph.D student said that chimpanzees defecate over the sides of their nests.

A separate study by Mattress Advisor found that the average person changes their sheets once every 24 days, with pillowcases having a marginally longer unwashed period, contributing to the buildup of bacteria and allergens in bedding. 

Thoemmes told the NC State News that “about 35 percent of bacteria in human beds stem from our own bodies, including fecal, oral and skin bacteria.” 

The study said that humans have created sleep environments to reduce our “exposure to soil and other environmental microbes” but have instead increased the bacteria “sourced from our own bodies.” 

“In some ways, our attempts to create a clean environment for ourselves may actually make our surroundings less ideal,” Thoemmes said.

A mushroom hunter's discovery of a conjoined white-tailed fawn in a Minnesota forest two years ago is being hailed by researchers as a landmark case among oddities in nature.

The fawns, which were stillborn, are believed to have been the first recorded case of a conjoined two-headed deer to have reached full term and born by their mother, according to a study recently published in the science journal American Midland Naturalist.

"It’s never been described before," Lou Cornicelli, co-author of the study and a wildlife research manager for the Minnesota Department of Natural Resources, told FOX9. "There are a few reported cases of two-headed ungulate fetuses, but nothing delivered to term. So, the uniqueness made it special."

In two other previous cases of conjoined white-tailed deer fawns, neither made it through the full pregnancy.

The discovery was made in May 2016, when a mushroom hunter came across the twins about a mile from the Mississippi River in Freeburg, Minn., located in the southeast portion of the state. The hunter contacted the Minnesota DNR, and the fawns were frozen until a necropsy could be conducted.

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Lab tests, including a CT scan and MRI, revealed the fawns had two separate had head-neck regions, which rejoined along the spine. The fawns had normal fur, heads, and legs, but internally had a shared liver, extra spleens, and gastrointestinal tracts, according to study co-author Gino D’Angelo, a researcher at the University of Georgia.

“Their anatomy indicates the fawns would never have been viable,” D’Angelo told UGA Today. “Yet, they were found groomed and in a natural position, suggesting that the doe tried to care for them after delivery. The maternal instinct is very strong.”

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Conjoined twins are commonly found in domestic animals, especially cattle and sheep, but are rare in other wildlife, according to D'Angelo.

The conjoined fawns have since been mounted on a bed of greenery by Wild Images In Motion Taxidermy, and will now be positioned as it is just waking from a nap. The mount will eventually be moved to the Minnesota DNR headquarters in St. Paul and placed on public display, according to FOX9.

"We all thought it was pretty neat and were glad to be able to show it to the public," Cornicelli told FOX9. "The taxidermists, Robert Utne and Jessica Brooks, did a great job with the mount and treated it very respectfully."

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Nearly 200 horses were found dead in a stock pond on Navajo land in Arizona after widespread drought and famine hit the area, officials said.

About 191 wild horses died of natural causes in the pond in Gray Mountain, Navajo Nation Vice President Jonathan Nez said in a news release. Nez and Navajo Nation President Russell Begaye went to the scene to assess the incident last Wednesday.

“These animals were searching for water to stay alive. In the process, they unfortunately burrowed themselves into the mud and couldn’t escape because they were so weak,” Nez said in the news release.

The horses will be buried onsite. Officials will be spreading hydrated lime to speed up decomposition before they are buried. The pond will then be permanently closed and covered and a new watering hole will be created at a different location.

This isn’t the first time dozens of horses were found dead near a watering pond. Officials said the incident was a seasonal issue as Navajo communities attempt to solve their growing wild horse population. The Navajo Nation — territory that covers parts of Arizona, New Mexico and Utah — has an estimated 50,000 to 70,000 feral horses on the land. Navajo Nation officials said the ecosystem cannot support the amount of horses. 

“This tragic incident exemplifies the problem the Navajo Nation faces in an overpopulation of feral horses,” Begaye said.

Arizona has been experiencing an unusual dry spell after a winter with little rain and snow. About 10 percent of Arizona is seeing exceptional drought, AZCentral reported. The forecast for the next three months also doesn’t offer much hope for more rain to quell the drought.