A study done at Australian National University and the National Evolutionary Synthesis Center found that North American songbirds that live with fluctuating weather ensure that their songs are heard regardless what the habitat they are live in.
"Birds that have more flexibility in their songs may be better able to cope with the different acoustic environments they experience throughout the year," co-author Iliana Medina of Australian National University said.
The researchers analysed song recordings from more than 400 male birds spanning 44 species of North American songbirds
