XV THE GREY HORNBILL

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Hornbills, like the Jews, are a peculiar race. There are no other birds like unto them. They are fowls of extravagant form. Their bodies are studies in disproportion. The beak and tail of each species would fit admirably a bird twice as big as their actual possessor, while birds less than half their size might well look askance at the wings with which hornbills are blessed. With the solitary exception of the “cake walk” of the adjutant (Leptoptilus dubius), I know of no sight in Nature more absurd than the flight of the hornbill. By dint of a series of vigorous flaps of its disproportionately short wings the bird manages to propel itself through the air. But the efforts put forth are too strenuous to be maintained for many seconds at a time. When it has managed to acquire a little impetus, the great bird gives its pinions a rest, and sails at a snail’s pace for a few seconds, after which, in order to save itself from falling, it violently flaps its wings again, and thus manages to win its way laboriously from one grove to another, in much the same way as the primitive flying reptiles must have done. Nor is the excitement over when it reaches its destination. Owing to the weight of the beak, the hornbill is in danger of toppling over, head foremost, as it alights on a branch, and assuredly would sometimes do so but for the long tail which serves to balance the great beak. So vigorously does the hornbill have to flap its wings during flight that the sound of the air rushing through them can be heard for nearly half a mile in the case of the largest species.

All hornbills are grotesque. The grey species is, however, the least grotesque, and approaches the most nearly to the appearance of normal birds. Three species of grey hornbill occur in India. The common grey hornbill (Lophoceros birostris) is characterised by the possession of what is known as a casque—an appendage which the other two species of grey hornbill lack. This is a horny excrescence from the upper surface of the beak. In some species the casque is so large as to extend over the greater part of the head and beak. No one has yet discovered its use. I am inclined to think that it has no use. The Malabar and Ceylonese grey hornbills, whose habits are identical with those of the common grey hornbill, thrive very well, in spite of the fact that they have no casque.

Lophoceros birostris is a bird nearly two feet in length. The prevailing hue of the plumage is greyish brown. The bill, which is four inches long, and the casque are blackish. Like the other members of this peculiar family, the grey hornbill possesses eyelashes, which increase the strangeness of its appearance. This species is found in most parts of the plains of India, except the Malabar coast, where it is replaced by Lophoceros griseus. The grey hornbill of Ceylon is the species L. gingalensis.

The majority of species of hornbill shun the vicinity of human beings. They are accordingly to be found only in the Terai and other great forest tracts. The grey hornbill, on the contrary, shows no fear of man. Although strictly arboreal in its habits, it occurs in those parts of the country that are not thickly wooded. A grove of trees is all that it demands. Grey hornbills are birds of the highway and the village. Usually they go about in small flocks.

Lophoceros birostris is particularly abundant in the sub-Himalayan districts of the United Provinces. In Oudh and the eastern part of Agra almost every village has its colony of grey hornbills. These hamlets are nearly always surrounded by trees, usually bamboos, among which the hornbills live. In many parts of Northern India grey hornbills are commonly seen in the avenues of trees which are planted along the high roads to shelter wayfarers from the midday sun.

Hornbills feed largely on fruit and are fond of that of the pipal and the banian trees. Their great bills are admirably suited to the plucking of fruit. When the hornbill has severed a berry, it tosses it into the air, catches it in the bill as it falls, and then swallows it. This is the most expeditious way of passing the food from the tip of its bill to the entrance to its gullet.

The cry of the grey hornbill is feeble for so large a bird, and is querulous, like that of the common kite.

The nesting habits of the hornbills are very remarkable. The eggs are deposited in a cavity in a tree. The cavity selected may be the result of decay in the wood, or it may have been hollowed out by a woodpecker or other bird. In either case the hornbill has usually to enlarge the cavity, for, being a big bird, it requires a spacious nest. When all preparations have been made, the female enters the nest hole, and does not emerge until some weeks later, when the eggs have been hatched and the young are ready to fly. Having entered the nest, the hen hornbill proceeds to reduce the size of the orifice by which she gained access to the nest cavity, by plastering it up with her ordure until the aperture is no more than a mere slit, only just large enough to enable her to insert her beak through it. Thus, during the whole period of incubation and brooding she is entirely dependent on the cock for food. And he never leaves her in the lurch. He is most assiduous in his attentions. When he reaches the trunk in which his wife is sitting, he, while clinging to the bark with his claws, taps the trunk with his bill, and thus apprises her of his arrival. She then thrusts her bill through the orifice and receives the food. When at length the young are ready to leave the nest, the mother emerges with her plumage in a much-bedraggled condition.

Why the hen hornbill behaves thus, why she is content to submit periodically to a term of “simple imprisonment,” is one of the unsolved riddles of Nature. This curious habit is peculiar to the hornbills, but seems to be common to every member of the family. In this connection it is interesting to note that the hoopoes, which are nearly related to the hornbills, have somewhat similar nesting habits. The hen hoopoe, although she does not adopt the heroic measure of closing up the entrance to the nest cavity, is said never to leave the nest until the young have emerged from the eggs. No sight is commoner in India than that of a hoopoe carrying food to the aperture of a hole in a tree, or in a building made of mud, in which his spouse is sitting. Another curious feature in the nesting habits of the hornbill does not appear to have been mentioned by any observer, and that is that during the nesting season hornbills go about in threes, and not in pairs. I have noticed this on two occasions, and Mr. Horne, in his interesting account of the nesting of the grey hornbill at Mainpuri, which is recorded in Hume’s Nests and Eggs of Indian Birds, mentions the presence of a third hornbill, who “used to hover about, watch proceedings, and sometimes quarrel with her accepted lord, but he never brought food to the female.” Although grey hornbills are by no means uncommon birds, very few nests seem to have been taken. The result is that there are several points regarding their nidification that need elucidation. Those who love the fowls of the air should lose no opportunity of studying the ways of these truly remarkable birds.

                                                                                                                                                                                                                                                                                                           

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