Peregrine incubating Kestrel's eggs.--On 13 th May 1961, I was prospecting some crags in the Great Glen, Inverness-shire, in the hope of rinding a pair of nesting Peregrines (Falco peregrinus). As I approached the most likely-looking face from below, a female Peregrine appeared in the air above and began to circle silently. She was still there half an hour later and her obvious reluctance to leave ...

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