Birdsong
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<birdfyi-glossary slug="birdsong"></birdfyi-glossary>Definition
Complex, often melodious vocalizations used primarily by males for territory defense and mate attraction.
Detailed Explanation
Birdsong is learned in most oscine passerines through a sensitive period in early life, when juveniles memorize a tutor's song template and then practice (subsong) until their vocalizations crystallize into the adult song. Song dialects develop when local populations share learned song variants. Males with larger repertoires or higher-quality songs often win territories and attract more mates, making song an honest signal of genetic quality, age, and developmental health.