Nose picking may be frowned on among humans but one particular type of primate has specialised fingers for doing just that, scientists have found.
For the first time, scientists have recorded the aye-aye ― a long-fingered lemur ― inserting an E.T.-esque finger into its nostrils.
It joins 12 other primate species, including humans, to have been documented picking their noses and eating the contents.
The scientists says their findings could shed light on the evolution and possible functional role of nose picking across these species.
“There is very little evidence about why we, and other animals, pick our nose,” said study author Anne-Claire Fabre, a scientific associate at the Natural History Museum in London.
“Nearly all the papers that you can find were written as jokes.
“Of the serious studies, there are a few in the field of psychology, but for biology there's hardly anything.
“One study shows that picking your nose can spread bacteria such as Staphylococcus, while another shows that people who eat their own snot have fewer dental cavities.”
The aye-aye belongs to a category of species known as strepsirrhine primates and is native to Madagascar.
Also known as the world's largest nocturnal primate, this lemur has rodent-like teeth and a specialised long and thin middle finger.
The aye-aye's fingers make up about 65 per cent of the length of the hand ― which the creature uses to locate food in wood by tapping on it and then extracting small grubs.
But researchers also observed something else about the aye-aye: the lemur uses its longest finger to pick its nose.
Ms Fabre said: “It was impossible not to notice this aye-aye picking its nose.
“This was not just a one-off behaviour but something that it was fully engaged in, inserting its extremely long finger a surprisingly long way down its nose and then sampling whatever it dug up by licking its finger clean.”
To better understand this behaviour, the research team used an imaging technique known as a CT scan ― usually used by medical professionals to obtain internal images of the body ― to look inside the skull and hand of an aye-aye specimen at the museum.
Their aim was to reconstruct the position of the middle finger inside the nasal cavity.
Findings suggested that the finger is likely to descend all the way into the throat.
Previous scientific research has suggested that there may be health benefits to eating snot, but the researchers believe that in this case there is a chance that the animal ingesting its own mucus may simply be doing so because of its texture, crunchiness and saltiness.
“It is great to see how museum specimens and digital methods can help us elucidate behaviours that are generally quite difficult to observe in their natural habitat,” said Roberto Portela Miguez, senior curator at Mammals at the Museum and study co-author.
“We hope that future studies will build on this work and help us understand why we and our closest relatives insist on picking our noses.”
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Defining head lice
Pediculus humanus capitis are tiny wingless insects that feed on blood from the human scalp. The adult head louse is up to 3mm long, has six legs, and is tan to greyish-white in colour. The female lives up to four weeks and, once mature, can lay up to 10 eggs per day. These tiny nits firmly attach to the base of the hair shaft, get incubated by body heat and hatch in eight days or so.
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