Both American frog and bullfrog are native to the United States and are amphibious food frogs. Its external form is very similar, and it is difficult to distinguish it at a glance. Its main features are briefly described as follows:

Skin color: Rana americana (hereinafter referred to as Rana americana) is generally yellow-brown, and its skin color can change with the environment, with different shades of round or oval markings, and its abdomen is white. The skin color of bullfrog is dark brown in winter, bright green in late spring and light brown in autumn, with different shades of tiger stripes, white abdomen and dark brown stripes.

Body shape: the frog is small, the adult frog is about13cm long and weighs 450-600g; The bullfrog is bigger than the American frog, with a body length of about 20 cm and a weight of 500-2000 grams. Their heads are different, too The head of the beautiful frog is small and looks like an ordinary local frog, which is yellow-brown. Bullfrog's head is big and flat, equal in length and width, and bright green. Bullfrog eyes are big and prominent, and the eardrum is very obvious; Beautiful frogs have small and prominent eyes and stout limbs, but they are not good at jumping.

Life habit: The frog is mild-natured, doesn't usually sing, only makes a "wow" sound, likes swimming, and is most suitable for growing in the water temperature of 18-32℃. It can tolerate the high temperature of 38℃, hibernate without eating below 5℃. Bullfrogs are active by nature, jumping at the sight of people, and screaming loudly, just like cows. It is most suitable to grow at the water temperature of 26℃-35℃, start feeding above 15℃, and overwinter below 10℃.

Disease resistance: China Rana chensinensis has stronger disease resistance than Rana chensinensis and higher survival rate, especially for red leg disease.