They can only swim at a maximum speed of about 30 km/h. Seals, by the way, have a maximum speed of 20 km/h.

This is called hemispheric sleep, in which one eye is closed & the brain rests on the other!In the wild, they sleep while swimming to protect themselves!

The body of the moon jellyfish(Aurelia aurita) is more than 90% water.

They grow large in the ocean & then return to the river.

They eat everything by swallowing it whole.
They use their many teeth to catch their food!