Red Eye Tree Frog (Agalychnis callidryas) Red eye tree frogs range from the southern Mexico to eastern Panama. Males are only 2 to 2½ inches long, while females are slightly larger at 2½ to three inches long. Both males and females have their signature red eyes with vertical pupils and a green back and a creamy white belly. Some have white spots on their back as well. The feet are yellow to orange in color. Color and size can vary depending on the geographic location the frog comes from. Red eye tree frogs from the northern part of the range tend to be slightly smaller with blue display flanks, while ones from the southern part of the range tend to be larger but have less colorful display flanks.