Coopers Hawk??

Nice images! The juveniles look very similar as previously mentioned. Coop's have overall rounded tail feathers while a Sharp Shinned the tail is straight across.

2n10 wrote in post #16352484
I saw my first Sharp-shinned over the weekend. I saw it flying in and thought is was a Kestrel. Size progression from my experiences Kestrel<Sharp-shinned<Cooper's<Red-tailed.

The trouble is that Coopers can vary in size enough that you sometimes can not use size as the sole indicator..

CyberDyneSystems wrote in post #16361269
The trouble is that Coopers can vary in size enough that you sometimes can not use size as the sole indicator..

To elaborate on this point.
While I agree that to the untrained eye, size should not be the main indicator, especially at longer distances (i.e. in flight). There is size a variation between male and female in all species of raptor, but a male Cooper's should still be noticeably larger (in both bulkiness and wingspan; which translates to flight pattern) than a female Sharp-shinned. Especially when a bird is perched at short distances.

Length of a male Cooper's vs a female Sharp-shinned can overlap (roughly around 14"), but when a person looks at most birds in flight, wingspan is more noticeable (and can be judged better) than total length.