I've always had a soft-spot for monsters.
In 9th grade Speech, I stood up in front of the entire class and performed a persuasive speech on the true existence of Big Foot. And, to be honest, I was dead serious. I found some articles arguing that accounts of Big Foot and the Yeti closely matched fossil evidence of a prehistoric great ape species called Gigantopithecus -- and couldn't it be possible that a few of them survived in dense forests and inhospitable climes, terrifying the humans who mistakenly called them "Big Foot"?
Well, I got an "A" on the speech so someone must have thought my arguments were plausible, at the least ...
|1976, from here.|
|Google maps, 2009, from here.|
Similar to theories surrounding Big Foot, cryptozoologists (isn't that the coolest job title ever?) postulate that Ogopogo may be the a remaining breed of plesiasaur, an aquatic dinosaur believed to be long-extinct.
|Plesiosaur, from here.|
|Coelacanth, from here.|