Distinguished by the difference in cloaca.

There is a circle of protruding white milk spots around the inner circumference of the male cloaca. The area around the hole is congested, red and swollen, with orange-flap-shaped muscles bulging. The male cloaca is long, with an oval orange-flap-like protrusion on the left and right sides, which are cloacal glands under the skin, and there is an obvious white granular protrusion around the cloaca.

The female cloaca is slightly smaller and has no cloacal glands, so there are no bulges or small particles around the hole. The muscles of the female cloaca are relaxed.

Extended information:

Living Habits

They often hide in caves during the day, with their heads facing outwards, making it easier to move at any time, to hunt for food and avoid enemies, and to attack when disturbed. Quickly leave the cave and swim into deep water. It comes out to move around and hunt for food in the evening and night. When swimming, its limbs are close to its abdomen, and it moves forward by swinging its tail and body to beat the water. It is very ferocious when hunting. It often waits among the rocks at the mouth of the beach. When it finds prey passing by, it suddenly opens its big mouth and swallows it whole, and then sends it to its stomach for slow digestion. ?

Adults eat a lot of food, including fish, frogs, crabs, snakes, shrimps, earthworms and aquatic insects, and sometimes small birds and rats. Interestingly, it is also good at "using tricks" to catch a kind of stone crab hidden in the cracks of rocks in the stream. It uses the stone crab's two large claws to clamp things and will not let go easily, and removes its tail with fishy secretions. The tip extends into the cracks of the stone, inducing the stone crab to use its pincers to pinch it.

Due to their slow metabolism, they have a strong ability to withstand hunger when food is scarce. Sometimes they will not starve to death even if they do not eat for 2-3 years. The activity gradually decreases from September to October, and in winter, they hibernate deep in caves or under large rocks in deep water, usually for up to 6 months, until they start to become active in March of the following year. However, it does not sleep deeply and can still crawl when frightened.

Baidu Encyclopedia-Chinese Giant Salamander