The world’s earliest four-legged animals had a body that helped deter painful acid buildup.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/MYwCH4jP0jo" height="1" width="1"/>
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The world’s earliest four-legged animals had a body that helped deter painful acid buildup.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/MYwCH4jP0jo" height="1" width="1"/>