Earth Day week and the living is easy for the magnificant turkey vultures that patrol the skies of Oakland County. Putrid possum, squished skunk and rancid raccoon are but three of the roadside delights of flattened flesh that have lured these soaring birds to our landscape.  And what better way for them to start their day of fiue dining than perched on a hot metal roof as they wait for morning thermals to ease their artistic flight.  Others have taken to ledges of Troy highrises and dead trees on country roadises.One of these vultures has now adopted my barn roof as his own abode-his morning eye on the world.  And that's just fine with me, for as they are adapting to our ways they do a clean up job on rural highway roadkill that is first rate.