For what it's worth, if I recall correctly from my viewing of Violet-crowned Hummingbird at Ramsey Cyn (Mile-High Lodge) in Arizona, 6/28/82, it was the least frequent visiting species of all those then present. One male bird would come only to one particular feeder, take a quick feed, leave, and return about 45 minutes later. If you weren't looking intently during the proper few seconds, you'd miss it and have another 45-minute wait. It was always silent. I mention this in case this is typical behavior for this species. Be patient and stay alert. (We need more lerts.) Chuck Almdale North Hills, CA.
v1.30 - 01/05/16 - Revamped cloud logic, optimized database queries, linked to eBird rarities. v1.23 - 12/08/11 - Added direct link to CBRC records. v1.22 - 12/03/11 - Corrected GMT offsets on dates. Added last 5 posts at top. v1.21 - 11/24/11 - Added direct link to range map for NA birds. v1.2 - 11/23/11 - Greatly improved graphing technology - separates month vs. year by posts. Added species auto-complete functionality. v1.14 - 11/22/11 - Added cloud bubble for common thread topics. v1.13 - 11/22/11 - Added integrated photos where available. v1.12 - 11/22/11 - Added multiple input boxes for additional refinement, negative search criteria (eg. -keyword). v1.11 - 11/22/11 - Added banding code, species look-up. Also direct link to recent eBird observations. v1.1 - 11/22/11 - Added 'date' functionality. Shows top 'month/year' combinations for a query. Restrict results to that 'month/year'. v1.0 - 11/21/11 - Initial version coded. Currently archiving 'lacobirds' and 'calbirds'.