Jawless. Ancient. And older than the dinosaurs. The lamprey’s life cycle is one of the strangest on Earth. In this episode, we follow its transformation from blind, worm-like larva buried in river sediment to parasitic, suction-mouthed drifter of lakes and oceans. Some migrate thousands of miles. Others never feed at all as adults. The lamprey is a living fossil — and a reminder of how alien early vertebrate evolution truly was.