"It is wonderful to observe," says Bechstein, "what great apparent delight the birds show when they see a female Cuckoo approach their abode. Instead of leaving their eggs, as they do when disturbed by the approach of other animals, they seem quite beside themselves for joy. The little Wren, for example, when brooding over its own eggs, immediately quits its nest on the approach of the Cuckoo, as though to make room to enable her to lay her egg more commodiously. Meanwhile she hops round her with such expressions of delight that her husband at length joins her, and both seem lavish in their thanks for the honour which the great bird confers upon them by selecting their nest for its own use." Although the above extract sounds very well, with all deference to Herr Bechstein, we are compelled to say that it is unfortunately not true. All the birds that we have seen who have had the very doubtful honour of having a Cuckoo's egg palmed upon them as their own, have seemed to testify in a striking manner their anguish at the threatened occurrence and their unmistakable desire to drive the Cuckoo away. So far from coming as a welcome visitor, the mother Cuckoo comes like a thief in the night; and no sooner has she laid her egg than she hastily takes her departure, as if quite conscious of the unfriendly character of her visit. However this may be, there is no doubt that the foster-parents brood over the Cuckoo's egg with the same assiduity as over their own; and it is only when the eggs of both are hatched that the real character of the intruder begins to show itself, doubtless to the great terror and dismay of the proper owners of the nest. [Illustration: THE JAY CUCKOO (_Coccystes glandarius_).] "Two Cuckoos and a Hedge Sparrow," writes Dr. Jenner, "were hatched in the same nest this morning. In a few hours after, a combat began between the Cuckoos for the possession of the nest, which continued undetermined until the next afternoon, when one of them, which was somewhat superior in size, turned out the other, together with the young Hedge Sparrow and an unhatched egg. This contest was very remarkable. The combatants alternately appeared to have the advantage, as each carried the other several times to the top of the nest, and then sank down again, oppressed by the weight of its burden, till at length, after various efforts, the strongest prevailed, and was afterwards brought up by the pair of Hedge Sparrows."