Birds are a diverse group of animals, with over 10,000 species worldwide. They can be found in various habitats, from forests to deserts. Some common species include sparrows, eagles, and penguins. Each species has unique adaptations, such as hummingbirds with their ability to hover and ostriches that are flightless but excel at running. Birds are characterized by feathers, beaks, and the ability to lay eggs. They play essential roles in ecosystems, such as pollination and seed dispersal. Some species, like flamingos, are known for their vibrant colors, while others, like owls, are recognized for their nocturnal habits.