The Fish That Wasn'T

Ha, ha! Fooled you. … This one's about a fish. Well, ... almost, ... not really ... It's about a whale ... They say a whale's a mammal; if so, I'm a fish Then again, we Mr. Limpets should take care what we wish Here's a fact: Cape Cod-type whale watches usually fail While onlookers consume an ocean of lager and ale So, remember when speaking of a neo-mammal like a whale The larger the creature, the longer its tale