Good point - that could well account for some of them at least.
People may remember that 1970s “Trimphones” had a sort of warble that supposedly attracted birds or caused them to respond (although this might have been an urban myth).
Good point - that could well account for some of them at least.
People may remember that 1970s “Trimphones” had a sort of warble that supposedly attracted birds or caused them to respond (although this might have been an urban myth).