THE CUCKOO Cuculus canorus, LinnAEus

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The arrival of the Cuckoo, as heralded by his well-known note, is eagerly awaited by every one who lives in the country, ornithologist or otherwise, and so anxious are some to record his arrival, that they persuade themselves that they have heard him before the March winds have abated. There is little doubt, however, that this species rarely, if ever, arrives in March, and not before mid-April can his pleasing note be generally heard. Throughout the whole of our islands this bird is common and well known, inhabiting equally the wild open country, the enclosed arable land, or thickly-wooded estates. It feeds entirely on insects, especially caterpillars, those of the common Tiger-moth being an especially favourite delicacy. Its flight is direct and fairly rapid, the short wings and long tail giving it very much the appearance of a Sparrow-Hawk, for which it is frequently mistaken by the smaller birds, and mobbed accordingly.

CUCKOO
Cuculus canorus
Adult (below). Young (above)

This bird solves housekeeping difficulties in the simplest way by leaving its eggs to the tender mercies of other species. It apparently usually watches other birds when building, and as soon as the chosen nest contains a few eggs, it lays its own egg on the ground, and picking it up in its beak deposits it in the nest, throwing out at the same time a few of the rightful eggs. The eggs are, as a rule, deposited one by one in a different nest of the same species, and when two Cuckoo’s eggs are found in the same nest, they are almost assuredly the produce of two different birds. Having deposited its eggs, the mother Cuckoo takes no further interest in her progeny, but continues to lead a life of leisure, till early in August both sexes leave us for their southern winter-quarters. The eggs of this species are extremely variable, but as a rule are of a pale bluish or greenish ground colour, with reddish spots and mottlings; sometimes they agree so closely with the eggs of their foster-parents as to be almost indistinguishable, but such cases are exceptional. When the young Cuckoo has been hatched about twenty-four hours, he sets to work to eject the other nestlings by getting them on his back, in which there is a hollow, and pushing them over the side of the nest. He is most importunate in his demands for food, and continues to be a burden on the foster-parents long after he is able to feed himself. Once, however, he is fledged, he wings his way southwards and we see him no more, till he returns the following spring to gladden us with his cheering “cuckoo.” Various species of insectivorous birds are made use of as foster-parents, and there is no doubt that much discrimination is exercised by the mother Cuckoo as to where and when to deposit her egg. The nests most favoured in this country are those of the Meadow Pipit, Pied Wagtail, Hedge Sparrow, Sedge and Reed Warblers, but over sixty different species of British Birds have been made use of at various times. Practically nothing is known as to whether Cuckoos pair, or if the female receives the attentions of several males, and the number of eggs laid by a single bird in the season is also doubtful, though about eight is said to be the number. Many interesting problems are thus still unsolved about one of our commonest birds, and if his character be not a very estimable one, we can but marvel at the workings of evolution which has enabled so curious and complicated a method of parasitism to be sufficiently successful to ensure the perpetuation of the race. It must be remembered that for the successful rearing of each young Cuckoo the mother has to find and recognise the nest of an insectivorous bird, and to lay her egg during the five days in which the foster-parent elect is laying her clutch. As regards the various stages of evolution that have caused the young Cuckoo to evolve as a murderer at his birth, and that have provided him with the means in the shape of a special hollow in his back, we know nothing, and can in the present state of our knowledge merely leave the problem in wonder and amazement.

The male is clear greyish ash on the back and throat; tail feathers blackish with small white spots on the margin. Under parts whitish, with dark bars on the flanks. The young vary considerably and are generally dark brown, more or less barred with rufous on the upper parts. Length 13 in.; wing 8·5 in.

                                                                                                                                                                                                                                                                                                           

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