ML610278709
Contributor
Date
Location
- Age
- Not specified
- Sex
- Not specified
Observation details
Two diagnostic characteristics stand out…First the bill color and second the central tail feather. The bill color of the bird on the right is pinkish/orange. The bill color of the bird on the left is greenish/yellow. According to the Pyle’s report comparing Nazca versus Masked, the pinkish/orange bill is Nazca. “….. Two distinct bill-color patterns emerged as the birds aged from juvenile to definitive plumage. Birds with dusky, horn color (medium-pale brownish, often tinged mustard or olive), orange, and/or pink in the bill base commonly had brighter orange-yellow or golden yellow but not green in the bill tip. By contrast, birds with dark blue, green, and/or yellow in the bill base commonly had green and/or yellow but not orange in the bill tip, and the tip was less often brighter than the base. I propose that the first category represents Nazca Boobies and the second represents Masked Boobies.…” From ‘Ocean Birds of the World’ by Howell … Nazca has a white central tail feather; Masked does not. Please see the pictures below…
Technical information
- Model
- Canon EOS 5D Mark IV
- Lens
- EF100-400mm f/4.5-5.6L IS II USM
- ISO
- 100
- Focal length
- 400 mm
- Flash
- Flash did not fire
- f-stop
- f/7.1
- Shutter speed
- 1/500 sec
- Dimensions
- 646 pixels x 718 pixels
- Original file size
- 111.67 KB