Octopuses use three hearts to keep their bodies well circulated.
Opahs, the only warm blooded fish species, are cold-blooded killers.
Everyone has dealt with cleaning the messy lint filter after several wash cycles, but not all the lint gets trapped.
Find out which fish will survive best in your little fishbowl!
Step (or swim) right up for a free scale cleaning! Cleaner wrasse provide a very valuable service for their underwater clients.