Cocos Tyrannulet Nesotriccus ridgwayi

Small and drab flycatcher found only on Cocos Island, which is located in the Pacific Ocean about 300 miles southwest of mainland Costa Rica. Most birds are brown above with a buffy belly, with tan wingbars and a pale eyebrow. Some individuals have a brighter yellow belly or an olive-tinged back. Inhabits humid forest as well as scrubby and swampy areas, often in dense vegetation. Typical song is a short, descending sputter.