ML139034031
Contributor
Tyler Stewart Media from this contributor Profile
Date
Location
Memorial Park & Prospect Lake
El Paso, Colorado, United States
Media from this location Illustrated Checklist- Age
- Not specified
- Sex
- Not specified
Media notes
Back gulls. Size difference in two individuals obvious in this photo. Presumptive female is right, presumptive male is left.
Observation details
One bird (back right) was significantly smaller than the other two HERG, giving me a Thayer's impression originally in the field. Given the sexual size dimorphism of this species, I think it falls in line with a rather small female HERG as opposed to Thayer's based on flat head shape and bill size. Unfortunately I did not obtain a view of the underwing. Though the mirrors seem a bit larger on the smaller bird, I wouldn't quite put them in the range of Thayer's.
Technical information
- Model
- SAMSUNG-SM-G935A
- ISO
- 50
- Focal length
- 4.2 mm
- Flash
- Flash did not fire
- f-stop
- f/1.7
- Shutter speed
- 1/1700 sec
- Dimensions
- 1831 pixels x 1366 pixels
- Original file size
- 904.43 KB