His recordings of the island's distinct bird species have played a major role in the recognition of several of them as endemic to Sri Lanka in the book Birds of South Asia. The Ripley Guide (2005) by Pamela C. Rasmussen and John C. Anderton.
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His expertise in vocalizations had enabled him to realize that an owl he heard calling near Kitulgala was an unknown species, and he later saw this bird in January 2001 in the Sinharaja rainforest.