A Swainsons Hawk monitored traffic at the Nugget Market parking lot on Jefferson Boulevard yesterday. See the UC Davis, California Raptor Center website for information about these magnificent birds of prey. Photo by Debbie.
Hawks are believed to have vision as good as 20/2, about eight times more acute than humans with good eyesight. This is because of many photoreceptors in the retina (Up to 1,000,000 per square mm, against 200,000 for humans), a very high number of nerves connecting the receptors to the brain, a second set of eye muscles not found in other animals, and an indented fovea, which magnifies the central part of the visual field.
Hawks are believed to have vision as good as 20/2, about eight times more acute than humans with good eyesight. This is because of many photoreceptors in the retina (Up to 1,000,000 per square mm, against 200,000 for humans), a very high number of nerves connecting the receptors to the brain, a second set of eye muscles not found in other animals, and an indented fovea, which magnifies the central part of the visual field.
4 comments:
YOUR HAWK photo is very good. It looks like you were pretty close as the angle is not distance but close. The hawk must be used to people.
Nice shot.
Thank you. I took the picture from the driver seat of my van, with the passenger window rolled down. I was afraid if I took the time to park and get out, he'd be gone.
It is an immature Red Tailed Hawk not a Swainsons
Tim is correct--it's definitely a juvenile red-tailed hawk, not a Swainson's.
Thank you!
Post a Comment