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In a sheltered spot the cuckoo was first heard on April 29, but only for one day; then, as the wind took up its accustomed northerly drift again, he was silent. They might be said to be about three weeks behind time, and the cuckoo a fortnight. The chiffchaff uttered his clear yet rather sad notes on April 26.
For example, if instead of resting content with just a bare position sufficient for the purpose of reproduction, the Guillemot were to hustle its neighbours from adjoining ledges, the Guillemot as a species would probably disappear; or if instead of securing an area capable of supplying sufficient food both for itself and its young, the Chiffchaff were to confine itself to a single tree, and, after the manner of the Guillemot, trust to spasmodic excursions into neutral ground for the purpose of obtaining food, the Chiffchaff as a species would probably not endure.
Such species as the Chiffchaff, Willow-Warbler, or Wood-Warbler are often sufficiently common to allow of three or more of their respective males being kept in view at the same time; and the disposition to occupy a definite position can be readily observed. Hence it is a simple matter to study the routine of the different individuals and to mark the extent of their wanderings.
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