Most aquatic species have fresh water and salt water varieties, however I cannot remember hearing of a freshwater cephalopod. Do they exist, and if not, what is the most likely reason why not?

A 9-year-old Oklahoma boy's unorthodox choice of pet has gone viral on TikTok as he's adopted an octopus that he named Terrance. Cal Clifford's parents said their son wanted an octopus as a pet more ...