My birding friends do winter "counts" of these Turkey Vultures, and they use the shorthand "TV" when speaking of them.
("Buzzards" are mostly birds of the "Old World"—amd there are
many species of them!)
This government-site has a good explanation, but its images appear only sporadically:
http://www.in.gov/dnr/fishwild/3320.htm
Most often, it's the purple "head-on" sketch
below the black silhouette that allows an easy identification.
I've moved the three images into the three "attachments", below, which should endure the years.
