An article published in the journal “Proceedings of the National Academy of Sciences” reports the identification of a worm-like animal that lived around 555 million years ago, in the Ediacaran period, in today’s Australia. A team of researchers led by Scott Evans of the University of California, Riverside, named this tiny creature Ikaria wariootia, identified by the impressions left in the burrows it dug. Its length ranged from 2 to 7 mm for a width between 1 and 2.5 mm, a very small creature which, however, could be a common ancestor to most animals.