Frigatebirds also place their heads in the shade of their wings, and males frequently flutter their gular pouches.
2.
The gular pouch is also buffy while the sides of the neck and shoulders become more ochraceous in color.
3.
Males have a well-developed gular pouch which is inflated when calling during display and helps produce the deep resonant calls.
4.
The gular pouch is not developed, the gular scales are feebly keeled, they are nearly as large as the ventrals.
5.
Hence, juveniles remain black at fledging, by which time the orange of the gular pouch has also turned pale scarlet.
6.
The males have inflatable red-coloured throat pouches called gular pouches, which they inflate to attract females during the mating season.
7.
The ventral surface is yellow or pinkish, with the gular pouch a creamy yellow anteriorly, and bluish-grey and black posteriorly.
8.
The legs, facial skin and gular pouch are initially light yellow; as the chicks age, the legs become pink, and the facial skin becomes dark grey.
9.
They have several adaptations for obtaining their prey including short powerful wings, a gular pouch for storing food, and their nostrils open upwards rather than pointing forward as in other tubenoses.
10.
The classification of this group as the traditional Pelecaniformes, united by feet that are totipalmate ( with all four toes linked by webbing ) and the presence of a gular pouch, persisted until the early 1990s.
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