The ptarmigan is a bird in the grouse family and chicks have feathers with intricate yellow, brown, grey, and chestnut patterns during the first weeks of life.

• 在松鸡鸟是在家庭和小松鸡有羽毛的鸡与错综复杂的黄色，棕色，灰色，和栗子色模式当在第一周的生活。