Can you guess what we made?

We researched about them and created a fact file. Some of us made a clay one. 

Some facts we found: 

Lifespan (in wild): One year
Weight: Up to 2kg
Body size: 2cm to 2m
Top speed: 8km/h
Diet: Fish, shrimp, crabs, tiny plants and even other species of jellyfish
Habitat: Oceans

Can you guess? 

 They  have tiny stinging cells in their tentacles to stun or paralyze their prey before they eat them.

Inside their bell-shaped body is an opening that is its mouth. They eat and discard waste from this opening.

 Tentacles hang down from the smooth bag like body and sting their prey.