ML622050798
Contributor
Date
Location
- Age and sex
- Adult, Unknown sex - 1
Media notes
Forster's Tern (adult, breeding plumage)
Observation details
Medium sized tern, light gray mantle, pale breast, belly, and underwings, large orange bill with black tip, orange legs and feet. Adults in breeding plumage. Could be confused with reported Common Terns in area. Distinguished by: (1) legs are relatively long (see photo #...8981), not short as in Common Tern; (2) the breast and belly are pale, nearly white rather than the distinct gray of Common Tern; (3) ; photos where it can be seen, the tail projects well beyond the wing tips when resting (not about equal length as in Common); (4) the outer primaries when extended and at rest are lighter (grayish) than expected for Common Tern (blackish); (5) underwing when extended in Forster’s are very pale whereas the underwing would be a darker gray with darker primaries for Common Tern; (6) I don’t see the distinct dark ribbing on the upper surface of the tail of the Common, instead the upper the upper surface appears very pale. On rocks to north of pier.
Technical information
- Model
- Canon EOS R6
- Lens
- RF100-500mm F4.5-7.1 L IS USM
- ISO
- 640
- Focal length
- 500 mm
- Flash
- Flash did not fire
- f-stop
- f/8.0
- Shutter speed
- 1/1250 sec
- Dimensions
- 1000 pixels x 1000 pixels
- Original file size
- 320.77 KB