Blue-crowned Motmot (Momotus momota) - Recorded at Rancho Oropendola near Orotina (Costa Rica) - this bird repeats this "bark" every 5 seconds or so over and over. Motmots are beautiful birds with long, knob-ended tails, which they swing back and forth side-to-side like a pendulum. The tail feathers emerge without the "knobs", but the barbs abrade off quickly in the area a few cm proximal to the end, leaving a "knob" attached only by the shaft.
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
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