The American Robin pictured above is certainly not looking for earthworms in a mountain ash tree, but for most of us these ubiquitous birds foraging in a grassy field is another familiar sight.

Dr Rob Butler has made a study of a question that has likely puzzled many of us over the years: ” How exactly do they find the earthworms that they eat? Do they use sight or sound or …?”

Read Rob’s article here to see what he found out.