Compare the silhouettes and coloring of these 2 birds. Both were seen just last weekend in Sahuarita and were hunting in the sky at the same time. The one on the left is a zone-tailed hawk. The one on the right is a turkey vulture.
Notice how much longer and and straighter the turkey vulture's wings are. With a wingspan of 67" its "fingers" are of almost equal length, forming a square tip, while the zone-tailed hawk 's fingers are graduated in length, forming a gentle curve. Also, the zone-tailed hawk has 5 fingers while the turkey vulture has 6. I saw my first zone-tailed hawk on July 2 right here in Sycamore Canyon, the day after I returned form Connecticut. It came flying toward my den window and at first I thought it was a turkey vulture, but then it seem to be flying differently. Then I though it might be a raven, but it seemed much larger. as the bird drew closer with deep scoops of its wings I was able to see the white bands in the tail and the feathered head. As my mouth dropped open in astonishment it flew directly at the window and over the house. It was so close I was able to see it with my bare eyes. Knocking myself out of my stupor, I dashed into the living room to grab my camera. I had to hurry and change the lens to the 70-300 mm zoom, since the camera was still packed up from my trip. By the time I got outside with camera and bins, the bird was much higher in the sky. Though I was able to capture some photos the image had to be cropped and enlarged so much that it was not worth posting, though I could still see the barred wings and the white bands in the tail. It was enough to confirm my ID. That makes bird number 78 for Sycamore Canyon!