Nazca Booby - Avo Stilt
Report

Contributor

Date

Location

Crespi Knoll (ORA Co.)
Orange, California, United States
Media from this location Illustrated Checklist
Map
Map Coordinates: 33.1800767, -117.8906276
Age
Not specified
Sex
Not specified

Observation details

Black and white booby that spent several minutes circling and plunge diving around the boat before flying off to the north. Identified by its orange-yellow bill with golden yellow tip, slender bill with slightly concave culmen, extensively white central rectrices, and dusky feathering on the head. Identification as Nazca supported by Todd McGrath, Dave Pereksta, and Peter Pyle, but Jon Dunn disagrees and prefers to consider it Masked/Nazca. See https://www.birdpop.org/docs/pubs/Pyle_2020_Molt_Age_and_ID_of_MABO_and_NABO.pdf for identification criteria. Many photos. Spotted by Steve Turley.

Technical information

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Original file size
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