By about 11.00 hrs on the morning of 16th January 2021, 5–6 cm of powdery snow had settled on my lawn in Sheringham, Norfolk. The regularly visiting family party of three Carrion Crows Corvus corone – a pair and its offspring from the previous summer – appeared mid-morning to feed on fallen seed below the hanging feeders. After a short time, the two adult crows began ploughing thei

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