Otus calayensis McGregor, Bull. Philippine Mus. (1904), 4, 17;
McGregor and Worcester, Hand-List (1906), 46.
Cok-cok bá-buy, Calayan.
Calayan (McGregor).
Adult male, light phase; type.--Lower parts dark cinnamon finely
mottled with brown and white, a few feathers on throat and breast
with dark brown shaft-stripes or spots; abdomen, flanks, and under
tail-coverts extensively white with very little cinnamon and the
brown mostly reduced to fine speckles; thighs and tarsi cinnamon with
cross-lines of dark brown; upper parts dark rufous finely mottled
with blackish brown, producing a rather uniform coloration; lores,
continuous with a line above eyes, white; tips of nasal and loral
bristles dusky brown or cinnamon, the longest about 20 mm.; modified
feathers of ear-coverts and below eye finely speckled with white and
dark brown; behind this the incomplete ruff forms a conspicuous rufous
band along side of head, but most of the feathers tipped with dusky
brown; feathers of ear-tufts dark rufous with irregular blackish spots
toward tips; wing-coverts and scapulars about same as back, some of
the latter with a large white area on outer web; exposed surface of
quills and tail similar and a little lighter than back; tail crossed
by several irregular lighter bars; quills dusky brown; outer webs
of outer primaries notched with pale cinnamon; inner webs of quills
crossed by pale cinnamon bars which become very wide on secondaries;
tarsi feathered nearly to toes. Bill, feet, and nails brown, the feet
with a slight green wash; iris bright yellow. Length, 216; wing, 169;
tail, 85; culmen, 21; tarsus, 31; middle toe with claw, 29.
Female.--In every way similar to the male. Length, 203; wing, 164;
tail, 81; culmen, 21; tarsus, 31; middle toe with claw, 28. In the
red phase, the white markings, except a few bars and freckles on
abdomen and flanks, are replaced by rufous.