It’s great to encounter a moon jelly (Aurelia labiata) on a dive. These graceful creatures slowly pulsate their bells to move through the water. Moon jellies can form large spawning groups in bays with hundreds of individuals, and this is an amazing sight to witness especially on a sunny day. These jellies are easily recognizable by their translucent bell and short tentacles. Moon jellies can grow to 16 inches (40 cm) across, and live worldwide in temperate seas, but here on the west coast they have a range from southern Alaska to southern California.