Haha while that would be awesome, I am an independent contractor with a particular company. The license really just gives me permission to provide historical information about Wiliamsburg, so it doesn't really apply to the wildlife. I probably could give a tour like that without a license, but I don't think you would see a whole lot of snakes in the city. I still give tours of our collection at the museum on occasion!
Also to give my own independent tours, I'd need to file for my own business license as well.