The eastern tree hyrax is thought to be a solitarily living arboreal
species of the forests of East Africa. However, in the coast of Kenya,
indigenous forests have been almost entirely cleared, and some of the
last tree hyrax populations live in limestone rocky formations and
caves. Interestingly, they seem to be living in social groups. Here, we
describe and document photographically these unique tree hyrax
populations. We also describe their acoustical communication and their
calling activity in three different habitats. Based on these animals'
physical appearance and acoustic analyses of their calls, they represent
the species eastern tree hyrax, Dendrohyrax validus. Due to immence
pressure from humans, the future of these small and isolated,
cave-living tree hyrax populations does not seem bright.