The Chisos Basin is the second best overall birding site, providing a long parade of mountain birds throughout the year, as well as lowland birds. The Basin is one of three spots for the annual Christmas Bird Count, along with Rio Grande Village and the Castolon-Santa Elena Canyon area. Over a five-year period, 147 species have been counted at these locations at Christmas time. The Colima warbler is probably the park’s most famous bird, because in all the United States it nests only here in the Chisos Mountains. It arrives in April from southwest Mexico and leaves in mid-September. The Big Bend has also remained one of the few successful breeding grounds of the peregrine falcon, a species that suffered much from pesticides. You are most likely to see peregrines during their spring migration, but nesting pairs have been sighted at Santa Elena, Mariscal, and Boquillas canyons and in the Chisos Mountains. These predatory birds prefer to nest in a scrape on a high cliff ledge. This falcon, about the size of a crow, is slaty backed and barred below, with a pair of black “mustaches” on the face. In its magnificent dive, the peregrine is one of the fastest moving animals on Earth. For advice on good birding spots at any time of the year, or on where to find specific birds, ask a ranger or at park headquarters. Also see Armchair Explorations. Birds of Big Bend [Illustration: Summer tanager] [Illustration: Gray vireo] [Illustration: Great horned owl] [Illustration: Yellow breasted chat] [Illustration: Blackthroated sparrow] [Illustration: Painted bunting] [Illustration: Belted kingfisher] [Illustration: Roadrunner] Floating the River [Illustration: Boulders dwarf the raft of Park Service employees landing in Santa Elena Canyon.] [Illustration: A kayaker drifts into reflections.] If you stumbled onto the Rio Grande upstream of the park, between El Paso and Presidio, during most of the year you’d say “Oh well, forget floating!” That stretch is most often dry, sapped by irrigation projects. But the Rio Grande gets a new lease on life as the Rio Conchos, draining Mexican mountains, flows into it at Presidio. You can thank the Rio Conchos for the prospects of floating the Big Bend. Along the park boundary and down to the Terrell-Val Verde County Line, the Rio Grande is designated a national wild and scenic river for 307.8 kilometers (191.2 miles). The “scenic” goes without saying. When you hit the rapids or a cross-channel current hits you, the “wild” designation rings true as well. Below is general information about floating the river. Particulars—including descriptions of the canyons and some rapids—are contained in, among others, the river guide series published by the Big Bend Natural History Association. (See Armchair Explorations.)