An article published in the journal “Science” describes an analysis of fossils that belong to the genus Dickinsonia, perhaps the most iconic of the so-called Ediacara biota, the organisms that lived during the Ediacaran period. A team of researchers conducted a highly sophisticated examination of fossils dating back some 558 million years ago, discovering traces of cholesterol, a steroid typical of animals. The conclusion is that the organisms of the genus Dickinsonia must be animals and this could be the proof that closes decades of discussions about their nature.