The Koffler Scientific Reserve at Jokers Hill, is a biological field station belonging to and managed by the University of Toronto. It occupies roughly 348 hectares of old fields, wetlands, grasslands, and forest lands in King Township, on the western portion of the Oak Ridges Moraine and close to the town of Newmarket, Ontario. The site has been called "an island in a sea of development"; its diverse ecosystems are home to many species of plants and animals.