See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Paleontologists working in Patagonia have unearthed the oldest-known ...

A 161 million-year-old fossil, linked to a line of extinct frog-like amphibians, is the oldest tadpole ever found. By Asher Elbein The metamorphosis of a frog from baby to adult is one of nature’s ...

"It was very striking." ...

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 ...

For decades, biologists thought that early tetrapods, ancient vertebrates that started conquering the land over 300 million years ago, developed like modern amphibians—beginning their lives as purely ...

A 3D anatomical atlas of the model organism Xenopus laevis (the African clawed frog) is now available to aid researchers in understanding embryonic development and metamorphosis—the intriguing process ...

Tadpoles have been wriggling in the world’s ponds for at least 161 million years. A newly detailed fossil finding pushes the record for earliest known tadpoles back an additional 30 million years, ...

A tadpole (stage 59, Xenopus tropicalis) at the beginning of metamorphosis (left) and a froglet (stage 66, X. tropicalis) after metamorphosis (right). The skeleton undergoes dramatic remodeling during ...

In this video, 20 mystery tadpoles are raised into fully grown frogs, documenting their fascinating metamorphosis and ...