text:  For today's Manu Minute, we are dishing up a bird that is often seen but not heard. The Iwa, or great frigate bird, flies high above our heads, performing acrobatic feats midair. We've got the song of this storied seabird today, thanks to the McCullough Library at the Cornell Laboratory of Ornithology. Here's University of Hawaii at Hilo's Patrick Hart with your Manu Minute.