URN:catalog:ICE:TRBL:add

Observer: 
Bob Meese
Location: 
Butte Sand and Gravel
Data Source: 
Personal Observation
Observation Date: 
2017-05-31
Best Estimate for Number of Birds Observed: 
10000
Minimum Estimate for Number of Birds Observed: 
8000
Maximum Estimate for Number of Birds Observed: 
12000
Affirmative Zero: 
Birds present
Type of Estimate: 
Visual and Untimed
Precision of Estimate: 
Scanning Blocks
Minutes spent at observation site: 
50
Breeding: 
Yes
Singing: 
Yes
Carrying Nest Material: 
Yes
Colony quiet, Incubation inferred: 
No
Adults Carrying Food: 
Yes
Fledglings out of Nest: 
No

loud song chorus and nestlings being fed; original 4,000 birds joined by 6,000 more 3 days ago, on 5/28/17 according to company staff; nest high in canopy above flooded basin, only colony in California to do so