Greenhouse Frog (Eleutherodactylus planirostris)
Order Anura, Family Eleutherodactylidae, Genus Eleutherodactylus. This family is characterized by frogs that lack a tadpole stage, undergoing direct development within the egg.
Species
Greenhouse Frog (Eleutherodactylus planirostris)
Family
Order Anura, Family Eleutherodactylidae, Genus Eleutherodactylus. This family is characterized by frogs that lack a tadpole stage, undergoing direct development within the egg.
Size
A very small species; adults typically range from 15 to 30 mm in snout-to-vent length (SVL). Females are generally larger than males. Metamorphs (hatchlings) are tiny, often less than 5 mm.
Conservation
IUCN Status: Least Concern. The population is stable and expanding in its introduced range. It is considered an invasive species in some regions (like Hawaii) due to its impact on native invertebrate populations.
Description
This diminutive immigrant from the Caribbean is a master of suburban living. Often heard but rarely seen, its faint chirps are a hallmark of humid tropical and subtropical nights. Visually, it blends perfectly into the damp soil and leaf litter where it hunts for tiny insects.
Key Features
Small size (<30mm), lacking toe webbing, bird-like chirpy call, and most notably, the lack of an aquatic tadpole stage evidenced by finding them far from water.
Physical Description
A small, somewhat flattened frog with a relatively long snout. It has large eyes with horizontal pupils and visible tympana. The limbs are slender, and the toes have small, expanded pads but lack webbing, reflecting its terrestrial lifestyle.
Skin Texture & Coloration
The skin is slightly granular or warty on the dorsal surface. Coloration is highly variable but generally includes shades of brown, bronze, or reddish-tan. There are two primary color morphs: a 'striped' morph with two light longitudinal stripes, and a 'mottled' morph (visible here) with irregular dark spots and blotches. The belly is usually pale and smooth.
Distinguishing Features
It can be identified by its small size, long snout, and lack of toe webbing. The presence of two color morphs is a diagnostic trait. Unlike many native North American frogs, this species does not possess dorsolateral folds.
Habitat
Highly adaptable terrestrial habitat; found in moist leaf litter, under bark, in gardens, and greenhouses. It thrives in suburban environments and is often accidentally transported in nursery plants. It does not require standing water for breeding.
Geographic Range
Native to Cuba, the Bahamas, and the Cayman Islands. It has been widely introduced and established in Florida, Hawaii, and parts of the Gulf Coast in the United States, as well as several Caribbean islands.
Behavior
Primarily nocturnal, spending the day hidden under logs, rocks, or debris. They are active jumpers and can be found climbing on low vegetation during humid nights.
Diet & Feeding
An active forager that preys on a variety of small invertebrates, including ants, beetles, mites, spiders, and springtails.
Reproduction
Unique among many frogs, it bypasses the aquatic tadpole stage. Females lay small clutches of about 10-20 eggs in moist soil or under debris. The eggs undergo direct development, and fully formed tiny frogs hatch directly from the egg capsules.
Vocalizations
The call is a series of very faint, bird-like chirps or 'tinks' that are often difficult to locate. It is much quieter than most other frog species and is typically heard during or after rain.
Life Cycle
Life cycle is strictly terrestrial. Development from egg to hatchling takes roughly 15-20 days depending on temperature. The absence of an aquatic stage allows them to colonize areas without permanent water sources.
Conservation Status
IUCN Status: Least Concern. The population is stable and expanding in its introduced range. It is considered an invasive species in some regions (like Hawaii) due to its impact on native invertebrate populations.
Toxicity & Defense
Non-toxic. Its primary defense is its excellent camouflage (crypsis) and its ability to jump rapidly into cover when disturbed.
Ecological Role
Acts as an efficient predator of micro-invertebrates. In its introduced range, it may compete with native frogs or small lizards for food and space.
Similar Species
Often confused with the Cricket Frog (Acris gryllus), which has webbing between toes, or the Coqui (Eleutherodactylus coqui), which is larger and has a much louder 'ko-kee' call.
Observation Tips
Look under garden pots, bricks, or moist leaf litter during the evening. Listening for their faint chirps on humid summer nights is the best way to locate a colony.
Handling & Safety
Safe to handle, but like all amphibians, their skin is permeable. Ensure hands are wet and free of lotions, soaps, or insect repellents. Always wash hands after handling any amphibian.
Seasonal Activity
Active year-round in tropical climates. In the southern US, activity peaks during the rainy summer months and slows down significantly during cool, dry winters.
Cultural Significance
Mostly known as a 'garden companion' in its introduced range. In Hawaii, it is sometimes viewed as a nuisance due to its competition with native species, though far less so than the louder Coqui.
Interesting Facts
Because it doesn't need ponds or streams, this frog can complete its entire life cycle inside a potted plant; this is likely how it was introduced to Florida and Hawaii.