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Madagascar’s lemurs use millipedes for their tummy troubles

Researchers observe that red-fronted lemurs may chew on millipedes to rid themselves of intestinal parasites
A female (left) and a male (right) red-fronted lemur with an infant (middle). Photo: Louise Peckre
Louise Peckre, Master of Science der Ethologie aus Lille in Frankreich, ist seit dem 1. November 2015 Doktorandin in der Abteilung Verhaltensökologie und Soziobiologie. Foto: Karin Tilch
Louise Peckre, Master of Science in Ethology from Lille in France, is doctoral student at the Behavioral Ecology and Sociobiology Unit since November 1st 2015. Photo: Karin Tilch
Ein männlicher Rotstirnmaki (Eulemur rufifrons) auf einem Baum in Madagaskar. Foto: Louise Peckre
A male red-fronted lemur (Eulemur rufifrons) on a tree in Madagascar. Photo: Louise Peckre
Ein junger weiblicher Rotstirnmaki im Kirindy-Wald auf Madagaskar. Foto: Louise Peckre
Young female redfronted lemur (Eulemur rufifrons) resting in Kirindy forest, Madagascar. Photo: Louise Peckre
Ein Tausendfüßler (Sechelleptus spp.) im Kirindy-Wald von Madagaskar. Foto: Louise Peckre
Millipede (Sechelleptus spp., Spirostreptidae) in Kirindy Forest, Madagascar. Photo: Louise Peckre
Ein erwachsener, weiblicher Rotstirnmaki kaut auf einem Tausendfüßler. Foto: Louise Peckre
Adult female redfronted lemur biting a millipede while rubbing her perianal area. Photo: Louise Peckre

Madagascar’s red-fronted lemurs may have a secret weapon from nature’s medicine cabinet: millipedes. This is according to a study led by Louise Peckre of the German Primate Center at the Leibniz Institute for Primate Research in Germany. Peckre and her colleagues believe that lemurs chew on millipedes to treat and prevent conditions such as itching or weight loss which are caused by parasites that might live in and around their guts. The research is published in the Springer-imprint journal Primates, which is the official journal of the Japan Monkey Centre.

Lemurs, alongside other primates like spider monkeys, have a habit of rubbing foreign objects, substances or materials over parts of their bodies. Experts refer to such actions as self-anointing, and they believe that animals do this as a form of communication, to remove toxic substances before ingestion, or as a way of self-medicating.

Peckre and her colleagues observed five groups of red-fronted lemurs (Eulemur rufifrons) in Kirindy Forest on the African island of Madagascar. During several observations they noted that six animals in the groups were chewing on millipedes (likely Sechelleptus). These millipedes had emerged a few hours after the first heavy rain of the season. The chewing produced copious amounts of an orange-coloured substance which the researchers assumed was a mixture of saliva and millipede secretions. The animals then rubbed the area around their genitals, anuses and tails with the chomped millipedes. Quite a few millipedes were also swallowed after much chewing.

“Self-anointment combined with eating millipede secretions may be a way of self-medication by red-fronted lemurs,” says Peckre.

The researchers believe that the lemurs eat the millipedes specifically because they secrete benzoquinone, a substance that is also known to repel mosquitoes. Self-anointment in this way could help the animals cleanse themselves of parasites often found in their gastric system and intestines and, more specifically, Oxyuridae nematodes that are known to cause irritation around animals’ anus area. Being infested with these worms and their eggs often causes an animal’s skin to break out in an itchy rash. The pinworm that can be problematic for humans is, for example, part of this group of nematodes.

“Strikingly, during the fur-rubbing observations, we noticed the presence of bald areas on the lower back of many animals. These are known as sit spots, and are likely caused by repeated rubbing,” explains Peckre. “These bald areas may then indicate the presence of infections by Oxyuridae in the population at the time.”

Peckre and her colleagues believe that the lemurs use the millipedes not only to treat the condition, but also to prevent it. The researchers would like to see further research that compares primate species that anoint their body without ingesting the millipedes to those species that also ingest the millipedes. They expect that primate species that are more exposed to digestive parasites would be more likely to eat the crushed millipedes. Several species of birds and mammals are known to rub themselves with millipedes and even to eat them. Most millipedes secrete a variety of chemicals to defend themselves from predators. These chemicals are sedative, repellent, irritant and toxic.

Original publication

Peckre LR, Defolie C, Kappeler PM, Fichtel C (2018): Potential self-medication using millipede secretions in red-fronted lemurs: combining anointment and ingestion for a joint action against gastro-intestinal parasites? Primates DOI: 10.1007/s10329-018-0674-7