To celebrate World Jelly Fish Day, we are highlighting the work of Amy Courtney, a comparative neurobiologist and National Geographic Explorer @AmyCourtneyy (X) Amy studies the nervous systems of unusual animals like worms, octopuses and jellies to uncover the basic principles of how they work. “Jelly-like creatures have been floating around in our oceans for around 600 million years. The jellies we see in our waters today are from two different animal groups, the cnidarians and the ctenophores.