Cable-roosting by Cormorants. On 29th March 1986, at the Cottam power station, on the River Trent, Nottinghamshire, I saw approximately 25 Cormorants Phalacrocorax carbo fishing, or perching on a washed-up tree. Whenever a boat approached, the Cormorants would fly up to, and land on, overhead power cables, returning only when the danger had passed. During the afternoons, the birds would


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