Some of the tiniest birds in the world have impressively loud voices. The Ruby-crowned Kinglet — that bright-headed sprite of the treetops — would be downright deafening if it were just a little bigger. Hummingbirds were originally named for the mechanical buzzing produced by their inconceivably fast wing-beats. But some males, such as this Costa’s Hummingbird of the Southwest, are equally notable for their vocal attainments. Late in winter, these tiny gems flash their purple throats and utter a startlingly loud, ear-piercing whine.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.