An article published in the journal “Nature” describes a research on Acanthostega gunnari (photo ©Ghedoghedo), that about 360 million years ago was one of the first tetrapods as it was one of the first vertebrates to have limbs recognizable as legs. A team of researchers from the universities of Cambridge and Copenhagen led by Jennifer Clack, who in 1987 discovered a deposit containing many skeletons of Acanthostega, examined those specimens and concluded that they were juveniles.