All fins on deck! Kogi, a dwarf sperm whale, teaches us all about cetaceans, which also includes dolphins and porpoises. Fun fact: the word cetacean comes from a Greek word meaning "sea monster," but Kogi's far too nice to be one of those. In fact, cetaceans are mammals (yep, just like humans). And they have lungs and breathe air--as do lions and tigers and bears! (Oh, my!) While dwarf sperm whales are the smallest type of whale, they have some really cool quirks. Their ink sacs help them evade predators, earning them the nickname "stealth whales." But we're just scratching the surface! Join Kogi on a deep dive explaining why cetaceans are so special.