He joined a Danish expedition to the Kai Islands in 1922 as an associate of the Danish zoologist Dr. Th.
The Keast's Tube-nosed Fruit Bat (Nyctimene keasti) is a species of megabat in the Pteropodidae family found in Babar, Tanimbar, and the Kai Islands.
The Kei flying fox (Pteropus keyensis) is a species of megabat in the Pteropus genus found in the Kai Islands of Indonesia.
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