San Pascual Swainson's hawk
This morning at 10AM (4/1/1’9) I watched a kettle of Turkey vultures rise just northwest of the entrance (people entrance not auto entrance) to the Safari Park in the San Pascual Valley. I was trying to pick out a Zone-tailed hawk but couldn’t find one. But at the bottom of the kettle was a light adult SWAINSON’S HAWK (dark chest, white below, darkish tail, dark remiges, leading half of the wings white) .
Source: SanDiegoRegionBirding Latest Reports