The bullfrog ( Lithobates catesbeianus ) is a large amphibian species, as it can measure between 10 and 20 cm in length and weigh between 60 and 900 grams. These frogs inhabit a huge variety of freshwater habitats including ponds, swamps, streams, and rivers; as well as man-made habitats, such as canals.
The danger of invasive species
The American bullfrog was introduced to the Pacific Northwest in the late 1920s or early 1930s as a food source. It is considered one of the most fearsome invasive species on the planet, because where it is not native, it is capable of surpassing the native frog species; but it is a problem that not only affects frogs. They alter the natural ecosystem and have practically no natural predators, making it a particularly dangerous creature (at best, its most common predators are large fish, river turtles, and snakes).
The bullfrog will eat anything it thinks it can get into its mouth, including small rodents, birds, and other frogs, which means it can have a detrimental impact on some threatened and endangered species or species of concern throughout the world. world. Furthermore, climate change is only further weakening the ability of these native species to withstand the entry and impact of these invasive species like the bullfrog, although it is not the only one.
Also considered invasive species are the beaver (Castor canadensis ), the golden mussel ( Limnoperna fortune) , the African snail ( Achatina fulica) , the poisonous sea snail ( Rapana venosa ), the lionfish ( Pterois volitans ), the yellow jacket wasp ( Vespula germanica) or the European bumblebee (Bombus terresres).
Has it been seen in Spain?
That’s how it is. The SEO / BirdLife organization warned in 2008 of the reproduction, for the first time, in the natural environment of the Ebro Delta, of this invasive species. The agency clarified that if measures were not taken to eradicate it, its proliferation would cause an ecological disaster.
Curiosities about the bullfrog
Bullfrogs, like all amphibians, have porous skin and respond quickly to changes in the environment. Their skin secretions make them very unpleasant for many animals. Regarding their reproduction, fertilization is external, and the females deposit up to 20,000 eggs in a foamy film in calm and protected waters. Fertilization is usually, but not always, performed by a single male. Tadpoles emerge approximately four days after fertilization, being able to remain in the tadpole stage for almost 3 years. Adults reach sexual maturity after 3 to 5 years.
In terms of their colors, adult specimens are greenish to dark brown with dark spots and golden eyes.
The maximum life expectancy in its natural habitat is estimated between 8-10 years, but in captivity it can reach 16.
What is its name? Because of the noisy sounds it makes, similar to those of a cow.
Did you know that they are capable of jumping up to 2 meters high? Or what is the same: 10 times the length of your own body.
