The herons are at the same time the largest and most regular visitors to the mere out of which the brook flows. One or more may generally be found there at some time of the day all the year round; but there is a remarkable diminution in their numbers during the nesting season. The nearest heronry must be about thirty miles distant, which probably explains their absence at that time. It also happens that just before the summer begins the mere is usually at its greatest height; the water is deep almost everywhere, and there are fewer places where the herons could fish with success. They fly at a great height in the air, and a single stroke of the huge wings seems to propel the bird a long distance; so that though at first sight they appear to move very slowly, the eye being deceived by the slow stroke of the wings, they really go at a good pace. They do not seem to have any regular hours of visiting the lake--though more seem to arrive in the afternoon--but they have distinct lines of flight along which they may be expected to come. In winter, however, they show more regularity, going down from the lake to the water-meadows in the evening, and returning in the early morning--that is, supposing the lake to be open and free from ice. If the shores are frozen a heron or two may be found in the water-meadows all day. In the autumn, after a dry summer, is the best time to watch them. The water is then low; numerous small islands appear, and long narrow sandbanks run out fifty or sixty yards with shoals on either side. After a very dry season the level of the water is so much reduced that in the broadest (and shallowest) part the actual strand where the water begins is a hundred yards or more from the nearest hedge. This is just what the heron likes, because no one can approach him over that flat expanse of dried mud without being immediately detected. I have seen as many as eight herons standing together in a row on one such narrow sandbank in the daytime, in regular order like soldiers: there were six more on adjacent islands. They were not feeding--simply standing motionless. As soon as it grew dark they dispersed, and ventured then down the lake to those places near which footpaths passed. But although the night seems the heron's principal feeding time, he frequently fishes in the day. Generally, his long neck enables him to see danger, but not always. Several times I have come right on a heron, when the banks of the brook were high and the bushes thick, before he has seen me, so as to be for the moment within five yards. His clumsy terror is quite ludicrous: try how he will he cannot fly fast at starting; he requires fifty yards to get properly underway.