Brown mouse lemurs are the only known host of the parasitic louse Lemurpediculus verruculosus. The lice have evolved to stay attached to the sparse hair on the lemurs' ears, where they feed on the lemur's blood, and can only survive for a few hours if separated from their host. Most transfer of lice between hosts is therefore by direct contact. Sarah Zohdy from the University of Helsinki tagged individual lice from trapped lemurs using colored nail varnish to see if they were transmitted during social interactions between hosts in the wild.
The team of researchers from Finland, USA, and Madagascar, found that the lice were transferred between 43% of the population -- all of them males. The lice were found on their ears, testes, and eyelids and the pattern of louse transfer provided new information about the habits of these hard-to-study creatures.
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