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Range DescriptionZosterops mouroniensis is restricted to, although common in, the upper reaches of the actively volcanic Mt Karthala, Grand Comoro (= Ngazidja), Comoro Islands. In 1988, the population was estimated to be "a few thousand birds at most" (Louette et al. 1988). Surveys in 2005 indicated that densities had remained stable since 1985 (C. Marsh in litt. 2007). However, the population is suspected to have declined since 1985 owing to a reduction in the extent of habitat as a result of volcanic activity. The extent of habitat is expected to recover through natural regeneration (C. Marsh in litt. 2007, 2009).