URN:catalog:ICE:TRBL:6406

Observer: 
William E Haas
Location: 
Dove Ridge Road
Observation Date: 
2011-04-15
Best Estimate for Number of Birds Observed: 
2250
Minimum Estimate for Number of Birds Observed: 
2000
Maximum Estimate for Number of Birds Observed: 
2800
Affirmative Zero: 
Birds present
Type of Estimate: 
Visual and Untimed
Precision of Estimate: 
Scanning Blocks
Minutes spent at observation site: 
60
Breeding: 
Yes
Singing: 
Yes
Carrying Nest Material: 
Yes
Colony quiet, Incubation inferred: 
No
Adults Carrying Food: 
No
Fledglings out of Nest: 
No

This colony is located within the Dove Ridge Conservation Bank along Shippee Road and split into two (virtual) sectors by Dove Ridge Road. The colony was still growing and the participants were involved primarily in territory defense and nest building. Egg-laying might have been initiated but probably in only at a limited number of nests. The current status of (and type of activity at) the colony was not one that lends itself to a particularly accurate estimate of the number of breeding pairs (there were numerous indicators that the colony was still growing) but based on my knowledge of other similar sites (e.g., a remarkably similar site in Shasta County in 2008 along Whitmore Road; specifically, an ephemeral stream with few large trees and the primary nesting substrate of blackberry), I estimate the colony to currently be in the range of 2200 – 2450 pairs with an additional (at minimum) 300 to 400 adults not yet involved. I observed, for example, a flock of 100 – 120 female tricolors foraging on the west side of the road, then moving to the reeds and blackberry on its east side; small groups of adult males were distributed along Shippee Road at numerous sites.