Prehistoric bird 'too fat and lazy' to fly

Prehistoric moa could actually fly but lost the ability after the extinction of dinosaurs made them "fat and lazy" on land, a new study suggests.
The discovery debunks global theories about the age of flightless birds and suggests the moa's ancestor flew to New Zealand from Antarctica.
Science had long thought ratites - Earth's largest flightless birds, which include moa, ostriches, and emus - descended from a common flightless ancestor.
But DNA analysis by Massey University revealed the moa was closely related to the tinamou - a small flighted bird still found in South America.
When dinosaurs died 65 million years ago, some birds became land-dwellers, which allowed them to put on more weight.
They eventually became too heavy to fly and simply gave up, evolving into moa in New Zealand as well as ostriches, emus and cassowaries in Australia.
Weird Science Factoid: Chained dogs are three times more likely to bite than unchained pooches. Not so sure about this statistic, surely that's why they're chained?
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