Cuban tree frog
|Cuban tree frog|
|On Grand Cayman|
Cuban tree frogs, scientifically known as (Osteopilus septentrionalis) are native to Cuba and the Bahamas, but mainly inhabit islands in the Caribbean region.  It is the largest tree frog of North America. Its wide diet and ability to thrive amongst humans has made it a highly invasive species with established colonies throughout peninsular Florida,  the Hawaiian island of Oahu, and throughout the Caribbean Islands.  These tree frogs can vary in size from 2 to 5.5 inches or (5 to 12.7 cm) in length. A nocturnal tree frog, is said to eat almost anything that will fit inside of its mouth. Cuban tree frogs have been known to be available as pets, but are not ideal. This is due to the fact that they secrete a toxic mucus from its skin, which may cause a fiery sensation in or around the eyes. 
Cuban tree frogs are the largest tree frogs in North America, ranging from 2 to 5.5 inches or (5 to 12.7 cm) in length.  It has a rough, warty skin.  Its toepads are much larger than those of other tree frogs, and it often has an orange tint to its eyes. 
Depending on the temperature and state of environment, Cuban tree frogs change in color.  Many individuals have darker splotches on the back, and some splotchy banding on the legs. In many individuals, the hidden surfaces of their legs are bright yellow. When the frog leaps to avoid a predator, these bright-yellow patches are visible, and may help to confuse the predator. Also, the skin on their heads is fused to the skull; if the head of an adult frog is rubbed (between the eyes), the skin does not move. This special adaptation prevents water loss, since fewer blood vessels occur in the "co-ossified" (fused) area. When an individual holds a Cuban tree frog, their skin secretes a toxic mucus which can cause a fiery sensation in or around their eyes. 
Known as outstanding tree climbers, the Cuban tree frogs sleep on trees during the day and hunt for food during the night. They will eat anything that can fit inside of their mouths with the help of their eyeballs. This species like to eat spiders, crickets, insects, cockroaches and lizards.  Their foraging will occasionally take them up utility poles, where they can cause short-circuits of utility switches, causing costly power outages. 
Cuban tree frogs are considered to be sexually dimorphic. What this means is that females cuban tree frogs are bigger than males. In order to tell the sex of the tree frog, just look on the thumb. If there is a black nuptial pad, then it is considered to be a male.  This allows for the males to hold females while they mate.
Cuban tree frogs breed year round, but most commonly in the wet season, between May and October. Optimal conditions are considered to be 81.5 °F (27.5 °C) with high humidity (97.8%) and rain.  They lay a partial clutch of eggs in varying size ranging from 100-1,000. The full clitch is on average a total of 3,961 and varies based on female body size. Eggs can hatch in under 30 hours and can fully develop in one month.  Much like their adult counterparts, newly hatched tadpoles occur in a variety of colors and patterns.  They have wide caudal fins and two rows of labial teeth on the top of their mouths and four rows on the bottom.  Tadpoles survive on algae and will occasionally eat other tadpoles,  and, on rare occasions, recently metamorphosed juveniles.  After transformation, they are between 0.55 and 0.67 inches (14 and 17 mm) long, and their tails are entirely absorbed. 
The Cuban tree frog is native to Cuba, the Bahamas, and the Cayman Islands. This large frog has been introduced in Puerto Rico, the US Virgin Islands, and the British Virgin Islands.  Whether the species was native to the Key West region of Florida is debated,  or if it was introduced to the area. First discovered in the 1930s, these frogs arrived via cargo ships in the 1800s.  They can survive in brackish water, which may have helped the species to spread to various islands.  The Cuban tree frogs' progressive colonization into the mainland of Florida is believed to be abetted by use of State Road A1A construction during the 1940s.  The species is now established in southern Florida and parts of the panhandle region, and can be found as far north as South Carolina. 
The Cuban tree frog is known to hitchhike on shipments of potted plants,  vegetation, packaging,  boats, and other motorized vehicles.  Once in a new location, the frogs become an invasive species. In Puerto Rico, they have become a predator of the endemic coquí frog.  They have several good colonizing traits, such as high fecundity, short generation time, a diverse diet, good competitive ability, and the ability to coexist with humans.  In addition, they also secrete a toxic mucus from their skin which helps to limit the number of natural predators. 
Cuban tree frogs are known to inhabit a variety of habitats, including estuaries, low-density suburban development, small towns, agricultural areas, particularly ones with exotic plants, and lowland forests and swamps.  Within their habitats, they can be found in damp, shady areas, particularly around shrubs and trees,  by cisterns, rain barrels,  and buildings. They like to be near medium and large sized trees and prefer conditions where the temperature lies above 10 degrees celsius. 
This large frog directly impacts native ecosystems by eating native frogs, lizards, and snakes, and poses a threat to the biodiversity of the areas into which it spreads by causing native tree frog populations to decline. These effects are most noticeable in urban and suburban areas, where native tree frogs, such as the American green tree frog (Hyla cinerea) and the squirrel treefrog (Hyla squirella) are rapidly disappearing. It has spread throughout peninsular Florida, and is also commonly found in isolated populations as far north as southern Georgia.  It is inadvertently carried on vehicles or ornamental plants, spreading to new areas, and has been transported as far north and west as Saskatchewan, Canada.  Because of its effects on the biodiversity, some experts have recommended killing the animal when it is found in a new habitat. This can be done, most humanely, through the application of Orajel to the abdominal skin, waiting fifteen minutes for the frog to be fully anaesthetized, and then placing it in a freezer for a few hours. 
Cuban tree frogs are commonly available in the pet trade within the United States.  They are inexpensive, and when cared for properly, tend to live five to 10 years. They feed readily on commercially available crickets, but while in captivity, they may turn to cannibalism.  Their toxic mucus can burn the eyes and trigger an allergic (or asthmatic) reaction; as a result, this species is not an ideal pet species, especially for children. The Cuban tree frog's colonization of Oahu is believed to be a result of accidental or deliberate release of pets. Therefore, the species is now banned from sale in Hawaii. Conviction of importation of a Cuban tree frog carries a maximum fine of $25,000 and a year in jail. 
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