Observations and collections of the fauna of the Dark Cave of Batu Caves
at Kuala Lumpur, Malaysia, were made between May 1959 and January 1961. The caverns
have an extensive invertebrate population, many species of which remain unidentified.
Twenty-three species of vertebrates were observed, the most abundant being Eonycteris
spelaea and Hipposideros diadema. The collections included 151 identified species of 94
families of invertebrates. Coprophagous mites of several species and Diptera were the
most abundant arthropods. Populations and species make-up varied from the entrance to
the rear of the caverns. Most species developed maximum populations where light and
moisture conditions were optimum.