Their underparts are buff to whitish with dark blotches , and the tail has a number of black and white bars .
Sexes are similar , but immature birds are dark brown above with spotting and streaks .
Sexes ' underparts are buff to whitish with dark blotches , and the tail has a number of black and white bars .
Sexes are similar , but immature birds are dark brown above with spotting and streaks .