Every Tuesday, we take curious questions from you, the listener - the types of questions that only enter your mind in the calm contemplation of the morning shower - and find an expert to stump up some answers.
Tonight's question comes courtesy of Ingrid in Gisborne, who emailed in to ask: Why do no two bird songs sound the same? How did they all end up being different?
To answer, University of Auckland professor of biological sciences and birdsong expert Dianne Brunton joins Emile Donovan.
