Del Mar birds of interest (and ID question – photo quiz)

Del Mar birds of interest (and ID question – photo quiz)
By – 1:25 pm
It is VERY slow out there. Thought I’d entice some folks with a photo quiz.While doing the San Dieguito monthly bird survey, JoAnne Kellogg and I found the only interesting species, the continuing Neotropic Cormorant on the wires at 7:00 this morning with 9 Double-crested Cormorants.Photo quiz: In addition, we had a bluebird that we initially assumed was an immature Western Bluebird. I’m curious if anyone can point to specific field marks that distinguish Western from Mountain in immature birds. The checklist with photos is here: https://ebird.org/checklist/S114790391Thank you in advance for any feedback.Sincerely,David TrisselSan Diego, CA