Cuban Treefrog (Osteopilus septentrionalis)
Order Anura, Family Hylidae, Genus Osteopilus. Members of this family are typical treefrogs, but the genus Osteopilus is known for its robust bodies and co-ossified (fused) skull skin in some species.
Species
Cuban Treefrog (Osteopilus septentrionalis)
Family
Order Anura, Family Hylidae, Genus Osteopilus. Members of this family are typical treefrogs, but the genus Osteopilus is known for its robust bodies and co-ossified (fused) skull skin in some species.
Size
One of the largest treefrogs in North America. Females are much larger, reaching 1.5 to 5.5 inches (3.8-14 cm) SVL. Males are smaller, typically 1 to 3 inches.
Conservation
IUCN: Least Concern. However, as an invasive species in many parts of its range, it is considered a significant ecological threat and is often targeted for removal/euthanasia programs to protect native biodiversity.
Description
The Cuban Treefrog is a dominant, hefty amphibian known for its 'bulldog' appearance among treefrogs. Often found clinging to the sides of houses or lurking in lush gardens, its presence is usually signaled by its large size and warty skin, making it a common but ecologically concerning sight for residents in Florida.
Key Features
Large toe pads, warty skin texture, SVL over 2 inches for adults, and skin fused to the skull (co-ossification).
Physical Description
A robust, large-bodied treefrog with a broad head and prominent, bulging eyes with horizontal pupils. It features very large, sticky toe pads used for climbing and a large, visible tympanum (eardrum) behind the eyes.
Skin Texture & Coloration
Skin is highly variable in color, ranging from gray and beige to olive-green or bronze, often with darker blotches or mottling. The texture is notoriously warty or granular compared to most native treefrogs. In older adults, the skin on the head is fused to the skull.
Distinguishing Features
The most diagnostic features are the exceptionally large toe pads (nearly the size of the eardrum) and the bumpy, warty skin. If felt (with gloves), the skin on top of the head in adults does not move freely because it is fused to the bone.
Habitat
Highly adaptable; found in both natural environments (forests, swamps) and urban settings (gardens, patios, utility boxes, and near outdoor lights where insects congregate). Often associated with humid, tropical microhabitats.
Geographic Range
Native to Cuba, the Bahamas, and the Cayman Islands. It has become a widespread invasive species in Florida and has established populations in parts of Georgia, the Caribbean, and occasionally transported via plants to other states.
Behavior
Nocturnal and highly predatory. It is a 'sit-and-wait' ambush predator. It is known for its aggressive displacement of native frogs. When threatened, it may produce a foul-smelling, irritating skin secretion.
Diet & Feeding
Generalist carnivore. It eats almost anything it can fit in its mouth, including insects, spiders, small lizards, and, most significantly, native treefrog species (e.g., Hyla cinerea).
Reproduction
Explosive breeders usually triggered by heavy rains. Breeding occurs in ponds, ditches, or even swimming pools. Amplexus is axillary. Females lay thousands of eggs in a surface film.
Vocalizations
The call is described as a raspy, low-pitched 'snore' or a 'grating squawk' often compared to the sound of a squeaky door. It is distinct from the high-pitched peeps or barks of native hylids.
Life Cycle
Typical aquatic-to-terrestrial metamorphosis. Eggs hatch in 1-2 days into rapidly growing tadpoles. Metamorphosis can occur within 3 to 10 weeks depending on temperature and food availability. Lifespan is approximately 5-10 years.
Conservation Status
IUCN: Least Concern. However, as an invasive species in many parts of its range, it is considered a significant ecological threat and is often targeted for removal/euthanasia programs to protect native biodiversity.
Toxicity & Defense
The skin secretes a mucus that can be highly irritating to human mucous membranes (eyes and nose), causing stinging or allergic reactions. It is not lethal to humans but can be toxic to small pets if ingested.
Ecological Role
Invasive apex predator of the micro-scale; it has caused significant declines in native treefrog populations due to competition for space and direct predation (oophagy and cannibalism).
Similar Species
American Green Treefrog (Hyla cinerea) - has smoother skin and lacks large pads; Southern Toad (Anaxyrus terrestris) - lacks toe pads and lives on the ground; Barking Treefrog (Hyla gratiosa) - more rounded, granular skin, but smaller pads.
Observation Tips
Look near outdoor lights at night, inside large-leafed plants like bromeliads or bananas, or check PVC pipes and vertical surfaces after a warm rain.
Handling & Safety
Gloves are highly recommended. After handling, do not touch your eyes or mouth until hands are washed thoroughly with soap, as the secretions cause intense irritation. Use wet hands if relocating.
Seasonal Activity
Active year-round in tropical climates, but activity peaks during the wet season (summer months). In cooler northern-Florida winters, they may seek shelter in insulated crevices or buildings.
Cultural Significance
In its expanded range, it is primarily viewed as a 'pest' or 'invader' in the gardening and conservation community. In its native Cuba, it is a standard part of the tropical island ecosystem.
Interesting Facts
This species can live inside electrical boxes and has been known to cause short circuits and power outages in parts of Florida. They can also change color significantly based on temperature and mood.