Tiny Tracks of First Complex Animal Life Discovered

[Live Science]   teensy sluglike animal that wriggled around the sediment in search of food at least 585 million years ago didn't die in vain. The tiny mover left behind tracks that researchers now say represent evidence of the earliest known bilateral animal, or multicellular life with bilateral symmetry. The finding, detailed in the June 29 issue of the journal Science, pushes back the date for the existence of advanced multicellular animal life by at least 30 million years.