Costas are a type of small, brightly colored birds belonging to the family Trochilidae, commonly known as hummingbirds. They are primarily found in the western regions of North America, particularly in areas like California and Arizona. Costas are known for their iridescent feathers and rapid wing beats, which allow them to hover in place while feeding on nectar from flowers. These birds are typically around 3 to 4 inches long and have a distinctive green and purple plumage. Costas are also known for their aggressive behavior when defending feeding territories. They play a crucial role in pollination, helping to fertilize plants as they move from flower to flower in search of food.