LSV - I didn't think we had any Yellow Crowned Night Herons here - though I did note you mention "rare". According to whatbird.com this bird doesn't in southern Cal. http://identify.whatbird.com/obj/53/_/Yellow-crowned_Night-Heron.aspx. Was there any mention as to what the Yellow heron was doing in this part? Fascinating and good eye !
You know birds -- the last visit to the OC was 35 years ago! It was an adult that time in 1977. San Diego County has some coming over from Mexico from time to time. I'd learned of this visitor from our local (very excited) birders. Looks like he has become a permanent resident.