Every year over 35 million pheasants, which originate from across Asia, are released in the UK. Their biomass exceeds that of all our native breeding birds put together, and they have the dubious distinction of being the animal most likely to be run over. Pheasants divide people but their theatrical early-spring displays are nonetheless worth watching. Cocks utter raspy calls and jump upwards in a flurry of whirring wings, producing low-frequency sound waves that amplify the territorial message.
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The BTO has more information on UK birds: bto.org/about-birds/birdfacts