What are the morphological characteristics of snapping turtles?

Crocodile turtles look like generals who have traveled from ancient times to modern times. It is domineering and fierce. It is a turtle that can bite off people's fingers and has a powerful jaw.

Real snapping turtles only live in the Mississippi River valley in North America. It is one of the most famous snapping turtles in the world. It keeps the characteristics of the primitive turtle, and its mouth, carapace shield and red tongue are all strange. The upper and lower jaws at the front end of the mouth are hooked, like an eagle's mouth, sharp enough to bite off people's fingers. The shields of the carapace are brown, and the shields of 13 rise and fall like 13 hills, and are arranged in three rows. There are many serrated protrusions on the edge of the shell, eyes on both sides of the mouth, small and divine, and many fleshy protrusions on the head and neck. Its tongue has a bright red worm-like fleshy protuberance, which is connected with the tongue through the annular muscle in the middle. Both ends can expand and contract freely. Its tail is thin and long, as hard as Strafe's. Unlike other turtles, its head and feet can't be retracted into the shell.

The real crocodile turtle looks like a crocodile and is a combination of a turtle and a crocodile, so it is called a real crocodile turtle. Its head is thick, it can't be completely retracted into the shell, its neck is short and thick, its collar and back are covered with brown thorns, its eyes are small, its mouth and jaw are small, its nose and mouth are sharp, its tail is sharp and long, and its edges are covered with fleshy thorns. There is a scaly back in the first two-thirds of the tail back, which is serrated, with a thin back shell, brown epithelium and three stripes on the back. The abdominal nail is smaller than the dorsal nail and is cross-shaped. The neck is grayish brown, with prominent spines, limbs and tail roots. The rear edge has teeth, the abdomen is white, and occasionally there are small black spots. It was black when it was young, with stout limbs, muscular, sharp and powerful claws and good at crawling.

Giant snapping turtles are huge. Adult tortoise shells are 0.4~0.7 meters long and weigh 45~75 kilograms. The largest can reach 200 kilograms, with a body length of 0.75~0.9 meters. Males are bigger than females.