Readers reply: what do birds do with their spare time?

The long-running series in which readers answer other readers' questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts? This week's question: Would airport security be less efficient if people passing through security were treated politely?We have a well-stocked bird feeder in the garden, like many other people, and this makes me think: what do birds do with their spare time if they don't have to spend so much time looking for wild food any more? Lily PaulsSend new questions to nq@theguardian.com. Continue reading...