First record of mutual allogrooming in wild northern red muntjac Muntiacus Vaginalis

We report the first record of mutual allogrooming in free-ranging wild northern red muntjac (Muntiacus vaginalis) from dense tropical forests of Similipal Tiger Reserve, Odisha, India. This observation is similar to reciprocal allogrooming behaviour between social partners, reported only in Impala (Aepyceros melampus) in free-ranging conditions. We video-recorded cooperative allogrooming between two female (one adult and another juvenile) northern red muntjacs. Behavioural quantification suggests that although both individuals exchanged equal numbers of grooming bouts, the adult female received a greater share of grooming time and episodes, respectively. The time spent on grooming as well as the number of tongue strokes delivered were found to be negatively correlated between the two individuals. The grooming pattern could possibly be attributed to kin selection and detailed work is required to understand this behaviour in this poorly-studied primitive deer. Our record indicates the possible existence of cooperative allogrooming in other ungulates of the Order Artiodactyla.