Spring is a time of renewal and regeneration. In April and May, male Sharp-tailed Grouse and Greater Prairie-Chickens display on courting areas known as a lek. They attract females with their dancing, colorful displays, and various noises. Whitetail and Mule Deer females deliver spotted fawns in the tall grasses and tree covered areas. Migratory birds such as ducks and many smaller birds arrive in their brightest plumage of the year. Cool season grasses quickly grow, bloom, and begin to set seed.