"As environments become more variable or unpredictable, song displays become more elaborate," said Carlos. "Survival and reproduction become more complicated when weather patterns are unpredictable because you don't know when food will be available or how long it will be around,"
Since complex songs indicate high intelligence, and females are choosier in demanding environments,
the male birds show off their big brains via song in order to attract a mate.
Botero searched sound archives worldwide and recorded songs himself in the wild. Then he and his
team compared those songs to climate records associated with the area it was recorded in. The
team found that species subject to more variable and unpredictable climates had more elaborate song displays.