SIRS,--A sample count of Great Crested Grebes (Podiceps c. cristatus) is to be taken during the coming summer under the auspices of the British Trust for Ornithology. The main object of the count is to ascertain as far as possible what effect the past two years' drought has had upon the birds. In some places breeding was made impossible through continual alteration of the water level, while other w...

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