Hatchimals may seem like they became this holiday season’s "it-toy" overnight, but the Furby-esque stuffed animal, which children coax out of an egg with 30-plus minutes of nuzzling, didn’t come out of nowhere. Launched globally on Oct. 7th, Hatchimals is the result of some pretty ingenious marketing, and comes from a company with a long track record of generating buzz. Here are 5 things marketers need to know about the craze.