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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

New Zealand once had a Dr. Seuss-worthy assortment of birds.

Take the giant moa, a flightless bird twice as tall as an adult human, which weighed more

than a sumo wrestler.

Then there was the Hasts eagle, the largest eagle ever known to exist.

It hunted the moa.

But as the story often goes, then came humans.

First the Maori, about 700 years ago, and then European colonists a couple hundred years ago.

And both sets of people drove many of New Zealand's unique birds to extinction.

Many of the surviving species today are now threatened or endangered. So you have species

like the kiwi, the kaka po, kaka, the takahe, all with nice Maori names, but all in danger of

it going extinct. Louis Valente, an evolutionary biologist at the Natural History Museum of Berlin.

Valenti and his colleagues used genetic data to build a tree of New Zealand's living and

extinct native birds.

They then used a model to estimate how long it took new species to emerge, which allowed them

to assess humans' bird-killing habits on an evolutionary time scale.

In a couple of centuries, humans wiped out 50 million years of evolutionary history.

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