I just learned something interesting. Though often sold as such, prawns aren’t just big shrimp! Strictly speaking, a prawn is actually a different type of animal. The gills have a different structure than shrimp, they have claws, they carry their eggs inside their body, and their flavor is different too. Shrimp carry their eggs outside their body under the tail.
To make things more confusing, however, they both live on the sea bottom and some shrimp can be larger than some prawns.