Key Features:
* Scales: Reptilian skin is covered in scales made of keratin.
* Ectothermic: They rely on external sources of heat to regulate their body temperature.
* Lay eggs: Most reptiles lay eggs, though some give birth to live young.
* Lungs: They breathe air using lungs.
* Three-chambered heart: Most reptiles have a three-chambered heart (with the exception of crocodilians, which have a four-chambered heart).
* Amniotic egg: Their eggs have a protective membrane that prevents them from drying out.
* Strong limbs: Most reptiles have strong limbs for walking or crawling, though some have lost their limbs through evolution.
* Specialized senses: Reptiles often have well-developed senses of sight, smell, and touch, depending on the species.
Diversity:
Reptiles encompass a wide range of species, including:
* Lizards: Diverse group with various sizes, shapes, and adaptations.
* Snakes: Legless reptiles with elongated bodies and a wide range of venom types.
* Turtles: Known for their hard shells that protect them from predators.
* Crocodiles: Large semi-aquatic reptiles with powerful jaws and teeth.
* Turtles: Including tortoises, sea turtles, and terrapins, characterized by their bony shells.
Evolution:
Reptiles evolved from amphibians around 340 million years ago and have diversified into many different forms. They are a fascinating and diverse group of animals that play an important role in ecosystems around the world.