A prehistoric prequel to Godzilla took place about 150 million years ago, when insects of monstrous size met their doom battling the ancestors of modern birds.
The epic struggle ended an era of insect growth spurts that coincided with upticks in the amount of oxygen in the air. Starting with the Cretaceous period, predators kept the sizes of insects down, researchers report online June 4 in the Proceedings of the National Academy of Sciences.
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