The Red-Tailed Hawk is a large brown bird with rounded, elliptical wings. It has a reddish tail which is difficult to observe from the ground. B. jamaicensis has a dark belly-band on its lightly colored underbody which is easily distinguished from below. Juvenile birds have streaked undersides. Red-tailed Hawk males measure from 19 to 25 inches (48 to 64 centimeters) in length, weighing from 24 to 46 ounces (690 to 1,300 grams). Females are slightly larger, weighing from 31 to 51 ounces (900 to 1,460 grams). Typical wingspan is 50 inches (127 centimeters).
The Coquí Frog, a tropical tree frog, produces a distinct two-note croak that sounds just like its name "ko-kee." The lower "ko" sound is a warning to other male frogs telling them to keep their distance. Only males listen and respond to "ko." The female coqui frogs listen to the higher-pitched "kee" note. When male frogs hear territorial calls from nearby male coqui frogs, they will drop the "kee" part of their call and concentrate on "ko" until individual frogs are spaced out to everyone's satisfaction. Then the coquis call to the female frogs with the higher-pitched "kee" notes.
Puerto Rican Parrot
The Puerto Rican Parrot is bright green, about a foot in length, with red forehead, blue primary wing feathers, and flesh-colored bill and feet. This bird feeds chiefly on wild fruits, particularly the sierra palm (Prestoria montana), but may also consume flowers and tender shoots. During October, when other fruits are scarce, the tabonuco fruit (Dacryodes excelsa) becomes an important food item. Rodriguez-Vidal (1959) lists over 5O different plants whose fruits are eaten by the parrots.