The coywolf*a mixture of western coyote and eastern wolf*is a hauntingly beautiful carnivore found increasingly on the streets of North American cities.  Its appearance is very recent - within the last 90 years - in evolutionary terms*a blip in time.  The story of how it came to be begins in Canada but by no means ends there.  It is an extraordinary tale of how quickly adaptation and evolution can occur*especially when humans interfere.  New York wildlife biologist Roland Kay is fascinated by this new hybrid*the product of a shifting gene pool that is now stabilizing.  Kays tracks and photographs coywolves with remote motion sensor cameras*collects road kill and scat*and obtains tissue and bone samples from fur trappers*hunters*and others to unravel the mysteries that define this new species.