to run into every coral reef they can find

4

The majestic order Cephalopoda:

Octopus: Give them a jar of peanut butter, and they will open it faster than you can. And you’ve been opening peanut butter jars for twenty years.

Squid: Can be small and adorable, but also large enough to take out a sperm whale. A SPERM WHALE. 

Cuttlefish: User of the most complex language of communication in the animal kingdom, besides humans.

AND THEN THERE’S THE NAUTILUS