Animal characteristics refer to the traits and features that define different species. These can include physical attributes like size, shape, and color, as well as behavioral traits such as feeding habits, mating rituals, and social structures. For example, mammals like dogs and cats have fur and give live birth, while birds have feathers and lay eggs. Additionally, animals can be classified based on their habitats and adaptations. Some species, like fish, are adapted to live in water, while others, like lions, thrive on land. Understanding these characteristics helps scientists study biodiversity and the roles animals play in their ecosystems.