Grevy's zebra and wild asses affiliation groups

Affiliation groups over time for grevy's zebra and wild asses. Data in contains three columns: day, group no., individual id. Day is the day (an encoding of a date) on which the groups of animals have been sighted. Group no. is the unique group id for each sighted group. All animals with the same group no. have been seen together. All group numbers are unique and do not repeat across days. Animal id is the unique identifier of an individual animal. The letter after the id indicates demographic status: Grevy's [s- stallion, b - bachelor, n - non-lactating, l - lactating], wild asses [T - territorial male, N - non-lactating, L - lactating].