The Cambridge natural history, Vol. 09 (of 10)Evans, A. H. (Arthur Humble)
Science
The Cambridge natural history, Vol. 09 (of 10)
Evans, A. H. (Arthur Humble)
Animals; Birds
Mr. Saunders's next section contains five Gulls resembling {308}the last
group in having no hood and a white tail; but here the young have the head
and tail-coverts unspotted. To this belong _L. bulleri_ of New Zealand, the
Chatham and Auckland Islands, with black bill and feet, which haunts inland
rivers; and also four marine forms with crimson bill and feet. These are
_L. scopulinus_ of New Zealand, the Chatham and Auckland Islands; the
larger _L. novae hollandiae_ of Australia, Tasmania, and New Caledonia; the
South African _L. hartlaubi_, found in Madagascar; and _L. gelastes_,
ranging from North-West Africa and the Mediterranean to the Caspian and
Sind, which lays its Tern-like eggs on sand-banks.
The third section differs in having a subterminal black band on the tail,
and, in the young, an irregularly striated hood. _L. crassirostris_, of the
Chinese and Japanese Seas, has the base of the tail and the under parts
white, the bill yellow, banded with red and black, the feet yellowish; _L.
belcheri_, of Peru and Chili, has a blackish mantle and stouter beak; _L.
heermani_ of western North America has the tail black except for a white
tip, a grey lower surface, red bill, and black feet; _L. modestus_, also of
Peru and Chili, differing in its decidedly grey tail and black beak.
The last-named is a connecting link with the fourth section, containing the
Hooded Gulls; that is, those with hoods in mature plumage, but no marked
hood in the young. Of these, all except the first three have the mantle
grey and the head more or less white in winter; they are rather small
birds, which chiefly inhabit the north, commonly breed in marshes, and
utter a shrill querulous cry.
_L. fuliginosus_ of the Galápagos, and _L. leucophthalmus_ of the Red Sea
and Gulf of Aden, are deep lead-coloured above with black head; but the
former is grey below with no admixture of white, while the latter has a
white nuchal collar, as has the much browner _L. hemprichi_, extending from
East Africa to Bombay. _L. cirrocephalus_ of Brazil, Argentina, and West
and Central East Africa, which occurs in Peru and Natal, has a pale grey
head; whereas a brown hood distinguishes _L. brunneicephalus_ of
Central–and in winter Southern–Asia, _L. maculipennis_, ranging from Brazil
to Patagonia and Chili, _L. glaucodes_ of Chili, Patagonia, and the
Falklands, and _L. ridibundus_, the British Black-headed or Peewit Gull,
which occupies Europe and temperate Asia, migrating to North Africa, India,
and China. These four differ considerably in the pattern of the
primaries,[200] {309}but all have red bill and feet. The colonies of our
marsh-breeding species supply large quantities of eggs for eating.
[Illustration: FIG. 62.–Great Black-headed Gull. _Larus ichthyaëtus._ ×
2/13.]
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