Genus NYROCA

The five species of Pochard, besides Netta rufina, that occur in India may either be kept in one genus or divided amongst two, three, or four genera on account of differences in the form of the bill and the presence or absence of a crest. The first plan is more convenient. All have the bill of moderate length, slightly raised at the base, and either equally broad throughout or slightly broader near the tip, with the culmen concave and the border of the feathered base above the gape convex; the nostril is situated about one-third the length of the bill from the base, and the lamella? are short and distant, less prominent than in Netta. Wings rather short, pointed; tail cuneate, of 14 feathers. Hind toe broadly lobed.

The breeding habits of all the species are very similar.

Key to the Species.

a. Males in ordinary plumage.
a1. Back and. scapulars distinctly barred or vermiculated.
a2. Head and neck chestnut………………….. N. ferina, p. 458.
b2. Head and neck black, glossed green………………….. N. marila, p. 462.
b1 Back and scapulars merely speckled.
c2. No crest.
a3. Head and neck dull chestnut………………….. N. ferruginea, p. 460.
b3. Head and neck black………………….. N. baeri, p. 461.
d2. A nuchal crest; head and neck black………………….. N. fuligula, p. 463.
b. Females.
c1. No crest.
e2. No white on forehead or lores.
c3. No white speculum on secondaries…………………..N. ferina, p. 458.
d3. A white speculum on secondaries.
a4. Head and neck rufous-brown………………….. N. ferruginea, p. 460.
b4. Head and neck blackish ………………….. N. baeri, p. 461.
f2. Forehead and lores white ………………….. N. marila, p. 462.
d1. A crest ………………….. N. fuligula, p. 463.

BookTitle: 
The Fauna Of British India, Including Ceylon And Burma-birds
Reference: 
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol. 4. 1898.
Title in Book: 
Genus NYROCA
Book Author: 
William Thomas Blanford
Year: 
1898
Page No: 
458
M_ID: 
507
M_SN: 
Aythya
Volume: 
Vol. 4
Term name: 
id: 
2348

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