The Mystery of New Zealand's only Native Land Mammal

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In new Zealand was thought to be a dominated by flightless birdswith only seals and bats making up its mammal population but 16 million years ago there lived a mammal. How did it get there? where did it come frome? what type of mammal was it?
Sources:
https://www.pnas.org/content/103/51/19419

Видео The Mystery of New Zealand's only Native Land Mammal канала Moth Light Media