In response to my post about the turkey vulture, reader Steve V. told me about his experiences with a similar species--the black vulture.
Steve and his dog Rosie were hiking on the Appalachian Trail a few years ago when they spotted the vultures, apparently teaching their offspring to fly--by pushing them over a little cliff. Repeatedly. And then walking them back to the top. Steve and Rosie saw the vultures many times that year and even found a foul-smelling cave where they nested.
Here's one of the pictures Steve took.
(I'm always interested in first-hand accounts and original photography of wildlife.)