Brown Reed Frog

Adult males measure 20–26 mm (0.79–1.02 in) and adult females 27–32 mm (1.1–1.3 in) in snout–vent length. The color pattern is highly variable. The dorsum in adult males is consistently tan to brown. There are varying levels of yellow or brown spots, or yellow blotches that may cover most of the dorsum. The yellow spots might have dark brown centers or edging. Most specimens have a brown or dark brown canthal stripe that runs from the nostril through the eye to at least the forelimb insertion, sometimes further to the inguinal region of the hind limb. The throat is canary yellow. The belly is grayish blue or white. The limbs are salmon red to red, with the concealed parts of the thighs being bright orangish red. In adult females, the dorsal ground color varies from orangish brown to mustard yellow. The canthal region is dark brown in most individuals, and that coloration may extend from the posterior of the orbit to the forelimb insertion. The dorsum may be completely without patterns, or the patterns can resemble the males ones, or may include large brown blotches with neon yellowish green borders. The abdomen is white with a light pink to grayish blue throat; the limbs have similar color. The hands and feet may be salmon red. …

Hyperolius castaneus occurs in swamps in montane grassland and forest at elevations of 1,600–2,850 m (5,250–9,350 ft) above sea level.