Thin-toed footprints pressed into a sandy riverbank more than 100 million years ago are the continent's oldest known bird tracks.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/Z67y-3huYZM" height="1" width="1"/>
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Thin-toed footprints pressed into a sandy riverbank more than 100 million years ago are the continent's oldest known bird tracks.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/Z67y-3huYZM" height="1" width="1"/>