Hermit Thrushes (HETH), White-throated Sparrows (WTSP), Myrtle Warblers (MYWA), and Ruby-crowned Kinglets (RCKI) were the the dominant species seen.
Warbler species observed or captured this week include: Orange-crowned (OCWA), Nashville (NAWA), Yellow (YEWA), Myrtle (MYWA), Black-throated Green (BTNW), Pine Warbler (PIWA), Western and Yellow Palm (WPWA, YPWA), Cerulean (CERW), Black-and-white (BAWW), Prothontary (PROW), Ovenbird (OVEN), Northern Waterthrush (NOWA), Louisiana Waterthrush (LOWA), and Common Yellowthroat (COYE). Three Louisiana Waterthrushes so far this year is more than we have captured in several years. Our normal for this overflight warbler is usually one, if we are lucky.
To better understand the demographics of a population migrating through this area, understanding age is important to determine. Below is a second year (SY) and and after-second year (ASY) Myrtle Warbler. Using the primary coverts (small feathers covering the primaries or flight feathers) we can age the birds shown below as (left bird) an ASY and right bird as an SY. Primary coverts (replaced only during the basic or summer molt) on the ASY are edged with gray and SY coverts are brownish and off-color from the secondary coverts (replaced in both the basic molt and the alternate or winter molt) that were replaced this winter. The SY bird has maintained its primary coverts since fledging out of the nest last summer.
|ATY male SSHA with horizontal barring on chest, gray hood and back and ruby colored eye.|
|ASY female with its horizontal barring on chest, and orange/yellow eyes.|
|Back of GRHE|