Claws are sharp, curved extensions found at the end of the toes of many animals, including cats, birds, and reptiles. They are made of a hard protein called keratin and serve various purposes, such as hunting, climbing, and defense. Claws can vary in size and shape depending on the animal's habitat and lifestyle. In addition to their functional uses, claws can also play a role in communication and social interactions among animals. For example, some species use their claws to display dominance or attract mates. Overall, claws are essential tools that help animals adapt to their environments.