Unfortunately it's likely that many many types of animals take advantage of low-altitude wind-streams, especially during migrations. But maybe we could place s

Unfortunately it's likely that many many types of animals take advantage of low-altitude wind-streams, especially during migrations. But maybe we could place several of them into the jet-stream (at 10-15 km) which is higher than all birds except one type of vulture. Edit: Nevermind, Google is working on exactly that: http://www.gizmag.com/google-x-makani-power-airborne-wind-turbine/27668/ http://www.gizmag.com/google-x-makani-power-airborne-wind-tu... The cable seems to be the most difficult part: http://en.wikipedia.org/wiki/High-altitude_wind_power http://en.wikipedia.org/wiki/High-altitude_wind_power