- the
rectrices of the tail.
These feathers may vary
widely in size – in fact, the
upper tail
tectrices of the male peafowl,
rather than its
rectrices, are...
- with S. n. latirostris.
Extensive white edging on
primary and
tertial rectrices. S. n.
latirostris Bolivia and
northwest Argentina.
Sometimes considered...
- well-developed
rectrices used in maneuvering. The
central pair of
these attach directly to the pygostyle, just as in Confuciusornis. The
other rectrices of Ornithurae...
-
presence of
eumelanosomes in the
preserved tail feathers. The
paired central rectrices are dark,
while the
smaller feathers are non-iridescent,
likely grey....
-
Juvenile bird at
Samburu National Reserve in
central Kenya – it has rufous-tawny
chest plumage, and its
outer rectrices lack the
streamers of
adult plumage....
-
feathers (the boat-billed
heron has only nine), 15–20 secondaries, and 12
rectrices (10 in the bitterns). The
feathers of the
herons are soft and the plumage...
- ten days of age they
still lack
rectrices and show
small or no
development of
secondary remiges (see
Figure 3C).
Rectrices do not
appear until at
least eight...
-
begin to shed
before the
rectrices. Generally, the
upper tail
covers begin to shed first.
Certain birds lose some
rectrices by the end of the
third w****...
- and all have fine black-and-white speckles,
except on the
remiges and
rectrices (main wing feathers),
which are
light brown with
darker bands. The heart-shaped...
- by
adaptive radiation. All true
finches have 9
primary remiges and 12
rectrices. The
basic plumage colour is brownish,
sometimes greenish; many have considerable...
