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BIRD WATCHING

changing and varying factor. One may say, indeed, that there can be no sexual sport or play into which the social element does not also, and necessarily, enter. This is, no doubt, true, strictly speaking, but the latter may be so merged in the former that practically it does not exist.

Some of the peewits' nuptial and non-aerial bizarreries are of this nature, but as they are peculiar, and seem to stand in some relation to another great class of avian activities, I shall reserve them for a future chapter.

illustration at end of ch. II, of a mouse by Arthur Rackham