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75-85 cm. Long and downcurved bill, all dark brown plumage with glossy blue-black wings and tail. Naked slaty-blackish head with pale blue neck collar, white patch on inner forewing. Dull reddish legs.
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Formerly recorded from Chiang Rai (Chiang Saen); Suphanburi (Ban
Yang); Ayutthaya; Surat Thani (Tapi river); Krabi (Khao Phanom Bencha,
Nong Kok); Trang (Thale Song Hong, near Khlong Muan, Ko Lanta); and
Phuket (Ko Nakha Yai, Ban Kapang, Ban Tha Rua).