URN:catalog:ICE:TRBL:add

Observer: 
Steve Foreman
Location: 
Potrero Hills Lane
Observation Date: 
2011-04-15
Best Estimate for Number of Birds Observed: 
1000
Minimum Estimate for Number of Birds Observed: 
650
Maximum Estimate for Number of Birds Observed: 
1200
Type of Estimate: 
Visual and Untimed
Precision of Estimate: 
Scanning Blocks
Minutes spent at observation site: 
45
Singing: 
Yes
Carrying Nest Material: 
Yes
Colony quiet, Incubation inferred: 
No
Adults Carrying Food: 
Yes
Fledglings out of Nest: 
No

Colony on hillslope above landfill access road in dense thistle and mustard patch. Tricoloreds off foraging in Hill Slough area and over onto Landfill, moving in and out of the colony area.