Perdicides.
The distinctive features of the birds composing this family are—a short beak, a small head, a round and massive body, bare tarsi, with spurs more or less developed, and a middling-sized back toe. The wings are sharp, pointed, or blunt, according to the species. This family comprehends the Gangas (Pterocles, Temm.), Syrrhaptes (Ill.), Quail (Coturnix), Partridge (Perdix, Briss.), Colin (Ortyx, Steph.), Francolin (Francolinus, Briss.), and Turnix (Bonap.).
Fig. 162.—Pin-tailed Sand Grouse (Pterocles setarius, Gould), Male and Female.
The Gangas, or Attoyens, are essentially birds of passage, and in consequence are provided with long and sharply-pointed wings; but the range of their journeys is not very great. They resemble the Plover in their power of lofty, rapid, and sustained flight, and inhabit the arid plains of Southern Europe, Asia, and Africa.
The Pin-tailed Sand Grouse (Pterocles setarius), [Fig. 162], annually makes its appearance in Spain and the South of France; it is common on the steppes of Southern Russia, of Tartary, Manchuria, Northern China, and in the North of Africa. Occasionally it breeds in the Pyrenees.
The Syrrhaptes, or Heteroclites, are characterised by the total absence of the back toe. They are closely allied to the Gangas, and, like them, have pointed wings, and are fond of travelling, but their flight is not so continuous, for in their journeys they are frequently compelled to alight. They inhabit the steppes of Tartary, and but rarely venture into Europe.
The Quail (Perdix coturnix, Latham) has a small beak, a short back toe inserted rather high up, tarsi furnished with a rudimentary spur in the shape of a horny tubercle, a thick-set body, sharply-pointed middling-sized wings, and hardly any tail. There are several species of this bird, only one of which is found in Europe.
The Common Quail ([Fig. 163]) is noted for its migrations. Every year innumerable flocks of them leave the regions of Africa, cross the Mediterranean, and, about the commencement of May, spread themselves over Europe. In the month of September they return, again accomplishing the same journey. The instinct which impels them to migrate from one country to another is so powerful that it is observed in Quails which are born in captivity. At the season of migration captive Quails become very uneasy, walk up and down their cages, and throw themselves against the bars with such force that they frequently fall back stunned, and sometimes even crush their skulls.
When it is considered that the Quail is a heavy bird, with wings comparatively small, and that it must cost them great labour to migrate, it is evident that it must be undertaken under strong impulse: probably the necessity of escaping the severity of winter, or of providing for their sustenance, is not the only cause, but that there is some sort of instinctive want, equally imperative with that of hunger, under which the birds are irresistibly forced to traverse such indefinite distances.