When he returned to the Philippines, he rejoined the bureau and was hired as assistant geologist to Busuanga Island, the northernmost islet off Palawan.
The Calamian treeshrew (Tupaia möllendorffi) is a treeshrew species found in the islands of Busuanga and Culion, which are part of the Calamian Islands group in the Philippines.
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Calamian Tagbanwa, on the other hand, are found in Baras coast, Busuanga Island, Coron Island, Linipacan Calibangbangan, a Cultural Preservation area (off limits to foreigners and the largest Contiguous grouping), and in some parts of El Nido.