Callulina hanseni and Callulina meteora are the two frog species located in Mkingu Nature Forest Reserve (MNFR), Eastern Arc Mountains, Tanzania. The two species coexist together. This study aims to understand the ecology of the two species, amidst the ongoing rapid forest loss (Hall et al. 2009). Apart from Loader et al. 2010(ab) and Menegon and Gower (2011) who described the species, no study has investigated the ecology of these species such as basic ecological characteristics like where they live (forest type and altitude), how they breed, and their feeding. Records from Loader et al. (2010ab) for C. hanseni and Menegon et al (2011) for C. meteora show the two species are forest-dependent with the extent of occurrence being less than 100km2, which led to the Critically Endangered categorization by the IUCN redlist. The two species co-exist in the higher elevations of the MNFR (Loader et al 2010; Menegon et al 2011). On-going surveys for forest toads Nectophrynoides spp in the same locality have recently recorded C. hanseni at lower elevations 1231m asl across a wider altitudinal zone, whereas C. meteora appears restricted to 1850m asl and above. These recent surveys may indicate previous underestimations of the extent of occurrence.