As regular CFZ-watchers will know, for some time Corinna has been doing a column for Animals & Men and a regular segment on On The Track... particularly about out-of-place birds and rare vagrants. There seem to be more and more bird stories from all over the world hitting the news these days so, to make room for them all - and to give them all equal and worthy coverage - she has set up this new blog to cover all things feathery and Fortean.

Friday, 21 March 2014

Humans Wiped Out Giant New Zealand Bird

MAR 19, 2014 03:59 PM ET // BY TIM WALL
 

Nine species of giant, flightless birds, known as moas, suddenly went extinct within two centuries of humans’ first arrival to New Zealand. Coincidence? No, a team of geneticists, biologists and archeologists recently wrote. The scientists found evidence that moas thrived before Polynesians colonized the islands in the 13th century.

The scientists analyzed genetic remains from 281 individual birds from four species of moa. The researchers looked for signs of dwindling moa populations in the 4,000 years before humans arrived. When animal populations shrink dramatically, their genetic diversity also decreases. Instead, the moa had a healthy variety of DNA, which suggested strong populations.

For example, the 3.6 meter (12 ft.) tall South Island giant moa (Dinornis robustus) had an estimated population of 9,200 individuals that may have been growing. Although another species, the 1.5 to 1.8 meter (4.9–5.9 ft.) tall eastern moa (Euryapteryx crassus), showed signs of a major historical die-off, that reduction in numbers likely occurred more than 17,900 years ago, thousands of years before humans arrived. Euryapteryx crassus had recovered and seemed to be thriving in the eastern lowland forests of New Zealand by the time humans arrived.

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