Fossil hunters scouring the streams of one of this country's palaeontology hotspots have found rare evidence of an ancient marine mammal.
The find, most likely a vertebra from a small whale, is somewhere between 16 and 19 million years old and experts from GNS Science say it adds to the picture of New Zealand's past biodiversity.
The vertebra fossil was found in Mangahouanga Stream in the Maungatani...
