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In page Mazumbai warty frog:

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Callulina kisiwamsitu is endemic to the West Usambara Mountains in Tanzania. Much of this area has been deforested and this species is found in the remains of the forested area around Lushoto including the Mazumbai Forest Reserve, Ambangula Forest Reserve and Shume-Mugambo Forest Reserve.[1][2] It is found climbing in trees and on the ground in damp forests with thick undergrowth.[1]