What do birds like eating and what decisions do they have to make when visiting a bird feeder? Not quite tuppence a bag - Brits spent around 200 million pounds a year on bird food. But what do birds like eating and what decisions do they have to make when visiting a feeder? Lindsay visits her mum's garden to get some close-up shots, Friederike Hillemann tells us about her research in Wytham Woods and Annette Fayet explains how puffins face similar problems.
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