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Call it a grand-phibian. Scientists have unearthed a fossil of the world’s oldest tadpole in Argentina — a shock finding that could alter our understanding of amphibian evolution, experts say.

For years, we've been asking, "Which came first: the chicken or the egg?" Maybe what we should have been asking is, "Which came first: the frog or... The oldest tadpole ever found is 161 million years ...

BUENOS AIRES (Reuters) - Scientists in Argentina have discovered excellently preserved fossil remains of the oldest-known tadpole, the larval stage of a large frog species that lived alongside ...

An artist depicts the tadpole and frog individuals of the Notobatrachus degiustoi species. The oldest known tadpole fossil, which belongs to this species, was found in the Patagonia region of ...