Young birds are brown or brownish-slate above and heavily streaked below.
Distribution - The Peregrine Falcon breeds from Alaska and the Canadian Arctic, south through the mountainous west and sparingly in the east, wintering coastally, north to British Columbia. They prefer open country, especially along rivers and lakes and occasionally in cities. Biology - During the 1950's and 1960's a pesticide was used that caused the eggshell to thin, drastically declining the population of this bird. Since then this pesticide has been banned and this Falcon's numbers are increasing again.