1, ecological hazard
Bullfrog is an exotic species, which was introduced to many areas, accelerating the extinction of local species diversity. Bullfrog has strong competition and adaptability. In the area where they were introduced, they often beat local amphibians, putting them in danger of extinction. Many countries and regions have listed it as a harmful species.
2. Disturb the ecological balance
Bullfrogs feed on amphibians such as insects and small fish, and their existence may lead to the imbalance between the upper and lower levels of the food chain, thus affecting the stability of the food web.
3. It is difficult to breed
The breeding of bullfrog requires high environmental conditions, such as humidity, temperature and water quality, which may be a challenge for farmers. The breeding habits of bullfrogs are also relatively complex and difficult to master.
Morphological characteristics of bullfrog;
The body shape is the same as that of the general frog, but the individual is larger. The female frog is 20 cm long, the male frog 18 cm, and the largest individual can reach more than 2 kg. The head is wide and flat. Mouth position, nose sharp and round. The exophthalmos of the eyeball is divided into upper and lower parts, and the lower eyelid has a wrinkled instantaneous membrane to close the eyeball. The back is slightly rough and has fine leather edges. The limbs are stout, the forelimbs are short and webbed. Male individuals have an obvious gray tumor-like process on the inside of the first toe. The hind limbs are long and big, and the toes are webbed.
Skin color changes with the living environment, usually green-brown on the back and limbs, with dark brown stripes on the back; The head and mouth are bright green; The ventral surface is white; The color below the larynx varies from male to female. Most females are white, gray or dark gray, and males are golden yellow. The song is very loud. It is named after Niu Jiao.
Reference to the above content: Baidu Encyclopedia-Bullfrog