female Goshawk

17 January 2008 3:30 PM. RVP
1 female Goshawk; possible immature.
The bird was cutting through the RV park at elevation of about 100 feet overhead; gliding and flapping. OT- 20 seconds. The bird gained elevation over the desert scrub. The bird had deep wing beats- somewhat leisurely for a Goshawk. The wing beats were stiff - and the wings were flat, not pleated or flexible. The wing beats were Cooper's-like - but too deep and leisurely for a Cooper's. Is this an indication of the bird being immature?