Tiny bones rewrite textbooks

December 13, 2006

Small but remarkable fossils found in New Zealand will prompt a major rewrite of prehistory textbooks, showing for the first time that the so-called "land of birds" was once home to mammals as well.

The tiny fossilised bones - part of a jaw and a leg - belonged to a unique, mouse-sized land animal unlike any other mammal known. They were unearthed from the rich St Bathans fossil bed, in the Central Otago region of South Island.

But the real shock to scientists was that it was there at all: until now, decades of searching had shown no hint that furry, warm-blooded animals had ever trodden on New Zealand soil, despite them having thrived so widely in other lands.

The fact that even one land mammal lived there, at least 16 million years ago, has put paid to the theory that New Zealand's diverse prehistoric bird fauna had evolved there because they had no competition from land mammals.

An international team led by Trevor Worthy, of the University of Adelaide, Alan Tennyson, of the Museum of New Zealand Te Papa Tongarewa, and Mike Archer, of the University of New South Wales, note that New Zealand separated from the ancient supercontinent of Gondwana more than 80 million years ago. The research has been published in the journal Proceedings of the National Academy of Sciences.

"This amazing find suggests that other mammals are waiting to be found there, and that New Zealand belonged to the birds only in more recent times," says Mr Worthy.

"It also suggests that New Zealand was not completely submerged, as some scientists thought, when sea levels were high about 25 to 30 million years ago."

The team believes that more mammal specimens may emerge, perhaps even species that pre-date the split between pouched marsupials and live-bearing placental mammals.

The St Bathans fossil field - which has also produced many other species of animals, including fish and birds - also promises to shed new light on climate change in the Australasian region, recording a massive shift from a warm, wet phase to a much cooler and drier period.

"This promises to be a richly rewarding fossil field and the heraldic discovery of New Zealand's first non-flying mammal represents just the first page of a fascinating new chapter in the history of the world's mammals," says Professor Archer.

The Australian Research Council recently awarded the team a $500,000 grant over the three years to further explore the St Bathans site.

Source: University of New South Wales

Explore further: Eavesdropping reveals hidden marine mammal populations in the ocean

Related Stories

Battle lines drawn fast at global whaling huddle

October 24, 2016

A key meeting on whales opened to early confrontation Monday with Japan seeking an end to a 30-year moratorium on whale hunting, and others proposing an Atlantic cetacean sanctuary.

Recommended for you

Humans, not climate change, wiped out Australian megafauna

January 20, 2017

New evidence involving the ancient poop of some of the huge and astonishing creatures that once roamed Australia indicates the primary cause of their extinction around 45,000 years ago was likely a result of humans, not climate ...

Major Viking Age manor discovered at Birka, Sweden

January 19, 2017

During spring of 2016 a number of large presumed house terraces were identified by the authors at Korshamn. As a consequence high resolution geophysical surveys using ground-penetrating radar were carried out in September ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.