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I've been studying my Helm Guide to Bird Identification (An in-depth look at Confusion Species) and there was an RBA report for Caspian and Yellow-legged here the previous day, so I hope it wasn't just wishful thinking! ;)
Comments on sightings are publicly visible. Only the sighting owner and their friends can comment on a sighting and reply to existing comments. The owner will be notified of any comments made.