That the number of Great Crested Grebes (Podiceps c. cristatus) nesting in some parts of England is largely determined by the frequency of nesting sites of a certain type can, I think, be proved from the remarkable rapidity they show in colonizing an entirely new water. `A new reservoir in the Midlands, completed in 1928, was filled with water for the first time early in January, 1929. The area of

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