Reptiles are a type of cold-blooded animals with distinctive characteristics. Their main characteristics are as follows:
1. Skin: The skin of reptiles is usually tough and thick, covered with horny scales or plate-like bones. These special skin structures prevent moisture loss while also providing protection and concealment.
2. Limbs: With the exception of snakes, most reptiles have limbs. Their limbs are usually short and stand upright on the sides of the body to support the body and walk.
3. Respiratory system: The respiratory system of reptiles is closed, that is, both oxygen and carbon dioxide are exchanged through the lungs.
4. Digestive system: The digestive system of reptiles is relatively long and complex, and usually includes organs such as the mouth, pharynx, stomach, intestines, liver and gallbladder.
5. Reproductive methods: Reptiles have various reproductive methods, including oviparous, viviparous and ovoviviparous.
In short, reptiles have distinctive features such as horny skin, limbs (except snakes), closed respiratory systems, complex digestive systems, and diverse reproductive methods.
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