- Flattened head and body, with a proportionately large head and a wide space between the eyes.
- Dorsal coloration has a greenish ground color with brown mottling.
Crossbar pattern is also present on hind limbs.
Eleutherodactylus marnockii reaches an adult length around 2-4 cm (0.75-1.5 in).
In North America, Eleutherodactylus marnockii is found in south-central Texas.
Eleutherodactylus marnockii is nocturnal. This species can run, as well as leap and hop, to seek shelter and will quickly (and easily) slip into cracks to evade predators.
Breeding in Eleutherodactylus marnockii peaks in April and May, but egg deposition may occur from February to December; females may lay eggs up to three times a year.
Eleutherodactylus marnockii is frequently found in limestone cliff crevices and cracks.
The cliff chirping frog is not a protected species in Texas and can be legally collected with a hunting license.
In Texas, Eleutherodactylus marnockii is restricted to the Hill Country and Edwards Plateau.