Two sets of fossilized footprints found in Victoria, Australia, are those of birds during the Early Cretaceous period, which would make them the oldest bird tracks found on the continent, according to a report in the journal Palaeontology. "These tracks are evidence that we had sizable, flying birds living alongside other kinds of dinosaurs on these polar, river floodplains, about 105 million years ago," said Emory University paleontologist Anthony Martin, who authored the report.

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