A hardy, adaptable bird that is undoubtedly the most abundant wild duck in the world. The male is unmistakable, with an iridescent green head, chestnut breast, light-gray body, white tail, and yellow bill. The female is mottled yellowish-brown with white tail feathers and a dark brown bill. Both male and female have a purplish-blue, white-bordered wing mark. Mallards are strong fliers and are exceptionally fast for their size, reaching speeds of 40 mph. It is a noisy species that inhabits most wetlands, including parks, ponds, and rivers.