Frog: Frog's body can be divided into three parts: head, trunk and limbs. Frog has four toes on its front foot, five toes on its back foot and webbed feet. There are two slightly bulging bags on both sides of frog's head. That's its eardrum. Frogs can hear sounds through it. Frog's back is green, smooth and soft, with patterns, and its abdomen is white.

2. Frogs: The male frog is 66-98 mm long, the female frog is 87- 12 1 mm long, and the weight can reach about 250 grams. The length of the head is slightly larger than the width of the head, and the snout is blunt. The length of the kiss is 0.5-2 times of the eye diameter of 65,438+,and the edge of the kiss is blunt and round. The cheeks are tilted outward, and the nostrils are slightly close to the nose and mouth or the nasal spacing between the nose and mouth is greater than the eye spacing.

The tympanic membrane smaller than the width of the upper eyelid is obvious, which is about 3/4 of the eye diameter. The maxillary teeth are sharp and the vomeroid teeth are extremely strong, which are concentrated from the front edge of the internal nostril to the midline, and the back end is not connected with the deep trace of the back end of the tongue. There are two dentate processes on the anterior side of the mandible, which coincide with the two depressions in the maxilla.

3. Bullfrog: The adult body length is generally between 70- 170 mm, and the maximum can reach more than 200 mm It is one of the largest frogs in the world. The skin is usually smooth, without dorsal folds, and the snout is wide and round. Women's eardrums are about the same size as their eyes, while men's are obviously larger than their eyes.

4, toad: rough skin, back covered with large and small bumps. This is sebaceous gland. The largest pair is the retroauricular gland located above the tympanic membrane of the head.

Second, different living habits.

1. Frog: Frogs often inhabit rivers, ponds, rice fields, etc. , mainly in the grass near the water, and sometimes lurking in the water. Mostly at night, mainly eating insects, but also eating some snails, snails, shrimps, small fish and so on.

2. Frog: Rana tigris often lives in paddy fields, ditches, ponds, reservoirs, swamps and other places with water below 900 meters above sea level, and its habitat changes with different life cycles such as foraging, breeding and wintering. The breeding season is mainly in still water and shallow water areas such as rice fields.

3. Bullfrog: It preys on invertebrates such as insects, shrimps and crabs, as well as small vertebrates such as small fish, small frogs, tadpoles, salamanders, young turtles, snakes and rats, and has a large appetite. Tadpoles mainly feed on plankton, algae, rotifers and larvae of various insects, mosses and aquatic plants in the natural environment.

4. Toad: I like to hide in mud holes, under wet stones, in the grass and beside ditches. Skin loses moisture easily, so it is often hidden during the day and becomes active at night and dusk.

Most adult toads live in underwater sediments or wet soil on land for winter. Stop eating, store glycogen in the body to maintain the lowest metabolism, and end hibernation when the temperature rises to 10 ~ 20℃ in the following year. They hunt and move at night, feeding on beetles, moths, snails and fly maggots. Artificial reproduction is easier than other frogs.

Third, the distribution area is different.

1. Frog: waters, wetlands and other areas on all continents of the world.

2. Frog: It is native to Cambodia, China, Laos, Myanmar, Thailand and Viet Nam. In China, it is mainly distributed in the south of the Yangtze River and in the north to Yancheng, Jiangsu.

3. Bullfrog: It is native to the east of the Rocky Mountains in North America, to Canada in the north and to northern Florida in the south.

4. Toads: mainly distributed in all parts of the world except Madagascar, Polynesia and Bipolar. There were no toads in Australia, but they were introduced from other regions, but they propagated too fast and were poisonous, which became one of the most serious problems in Australia at present.

Refer to the above? Baidu encyclopedia-toad

Refer to the above? Baidu encyclopedia-bullfrog

Refer to the above? Baidu encyclopedia-tiger frog

Refer to the above? Baidu encyclopedia-frog