Do jellyfish swim in groups or do they swim alone?

Question: Do jellyfish swim in groups or do they swim alone?
- Keywords:
  jellyfish,
  swim
Asked by Thomasthetankengine to Jasmine on 16 Nov 2018.
- Jasmine answered on 16 Nov 2018:
  
  They mostly swim in large groups. Usually, when you see a jellyfish on the beach you always see more than one and that’s because they swim in these large groups. A group of jellyfish is called a smack!

Question: Do jellyfish swim in groups or do they swim alone?