Warning: The video contained in the link is not suitable for those with a sensitive disposition …
It is a biological mission that began with a chance encounter with a lemur that was picking its nose. It wasn’t just any lemur; an aye-aye was filmed by Prof Anne-Claire Fabre from the University of Bern burying its elongated finger in its nostril.
Aye-ayes are nocturnal primates found only in Madagascar. They are famous for their strange, skinny, long fingers, which they use to fish grubs out of branches.
“I wanted to know where is this finger going?” Prof Fabretold the BBC. “It was inserting the entire length and, [when you look at] the length of its head, it was like - where is it going?” she recalled. “I wondered - is it inserting it into its brain? It was so weird and seemed impossible.”
The question intrigued Prof Fabre so much that she conducted 3D anatomical analysis of the aye-aye’s head, to reconstruct the seemingly impossible anatomy of the nose picking.
“It was going into the sinus and from the sinus into the throat and into the mouth,” she explained.
With her colleagues, Prof Fabre searched the scientific literature for evidence of other animals that pick their noses. In a study they published in the Journal of Zoology, the team found 12 examples of primates caught in the nose-picking act. Fundamentally, Prof Fabre says it is likely to have evolved for a reason and should be investigated.
“We have no idea about its functional role,” she told the BBC. “And it could be advantageous.”
Rather than being simply disgusting, it may have benefits for some species and since so many animals appear to share this habit, Prof Fabre said, “I think we really need to investigate it”.
I am reminded of the childish chant:
Everybody’s doing it, doing it
Picking their nose and chewing it, chewing it
Thinking it’s candy, but it’s not …
… it’s snot!