Red Warblers only sing on sunny mornings during the breeding season — so hearing their song is as good as checking the weather forecast. Weighing less than a triple A battery, Red Warblers are endemic to the highlands of Mexico and live in humid forests of pine, oak, and fir. More info and transcript at BirdNote.org. Want more BirdNote? Subscribe to our weekly newsletter. Sign up for BirdNote+ to get ad-free listening and other perks. BirdNote is a nonprofit. Your tax-deductible gift makes these shows possible.