It is, however, the sparrows and starlings, rivals for the nesting sites, who show themselves the irreconcilable enemies of the returned prodigals. Terrific battles are continually enacted between them with varying fortunes, and the anecdotes of these frays would fill a volume. Jesse tells of a feud at Hampton Court, in the course of which the swallows, having only then completed their nest, were evicted by sparrows, who forthwith took possession and hatched out their eggs. Then came Nemesis, for the sparrows were compelled to go foraging for food with which to fill the greedy beaks, and during their enforced absence the swallows returned in force, threw the nestlings out, and demolished the home. The sparrows sought other quarters, and the swallows triumphantly built a new nest on the ruins of the old. A German writer relates a case of revolting reprisal on the part of some swallows against a sparrow that appropriated their nest and refused to quit. After repeated failure to evict the intruder, the swallows, helped by other members of the colony, calmly plastered up the front door so effectually that the unfortunate sparrow was walled up alive and died of hunger. This refined mode of torture is not unknown in the history of mankind, but seems singularly unsuited to creatures so fragile. The nests of these birds show, as a rule, little departure from the conventional plan, but they do adapt their architecture to circumstances, and I remember being much struck on one occasion by the absence of any dome or roof. It was in Asia Minor, on the seashore, that I came upon a cottage long deserted, its door hanging by one hinge, and all the glass gone from the windows. In the empty rooms numerous swallows were rearing twittering broods in roofless nests. No doubt the birds realised that they had nothing to fear from rain, and were reluctant to waste time and labour in covering their homes with unnecessary roofs. Most birds are careful in the education of their young, and indeed thorough training at an early stage must be essential in the case of creatures that are left to protect themselves and to find their own food when only a few weeks old. Fortunately they develop with a rapidity that puts man and other mammals to shame, and the helpless bald little swift lying agape in the nest will in another fortnight be able to fly across Europe. One of the most favoured observers of the early teaching given by the mother-swallow to her brood was an angler who told me how, one evening when he was fishing in some ponds at no great distance from London, a number of baby swallows alighted on his rod. He kept as still as possible, fearful of alarming his interesting visitors, but he must at last have moved, for, with one accord, they all fell off his rod together, skimmed over the surface of the water and disappeared in the direction from which they had come a few moments earlier.