...This was a perfect oasis of verdure, covered with large nabbuk trees, about thirty feet high, and forming a mixture of the densest coverts, with small open glades of rich but low herbage... 
Samuel White Baker 「In the Heart of Africa」
...This species in summeris entirely black except the wing coverts whichare white...
Chester A. Reed 「The Bird Book」
...They are but ten inches in length; the whole head, neck and under parts areblack; the back, wings and tail are slaty and the under tail coverts are white...
Chester A. Reed 「The Bird Book」
...The male birds cannot be mistaken forany other species because of the white crown,wing coverts and underparts and the broad greenstripe, back of the eye...
Chester A. Reed 「The Bird Book」
...The Cinnamon Teal is another small Duck,marked by the uniform rich chestnut plumage andlight blue wing coverts...
Chester A. Reed 「The Bird Book」
...This species, which has the form and habits ofthe preceding, is blackish above and on the breast;the rump and the base of the tail are white, beingseparated from each other by the black tail coverts...
Chester A. Reed 「The Bird Book」
...This Longspur which breeds in company withthe preceding, throughout its range, can be distinguishedfrom it by thesmall black patch on thebreast, the black crown, andchestnut wing coverts...
Chester A. Reed 「The Bird Book」
...This beautiful Warbler is yellowbelow and on the rump, streaked onthe breast and sides with black;the ear coverts and sometimes the throat arechestnut...
Chester A. Reed 「The Bird Book」
...This beautiful Redstart is blackwith a large white patch on thewing coverts, white outer tailfeathers, and with the belly andmiddle of the breast bright red...
Chester A. Reed 「The Bird Book」
...Cap black; throat, breast, and neck, allaround, white tinged with straw; back, lower belly,upper and under tail coverts brownish slate...
Frank M. Chapman 「Color Key to North American Birds」
...Tail forked; abovesooty brownish black; below browner; lesser wing covertsgrayish brown; longer upper tail coverts not tippedwith black...
Frank M. Chapman 「Color Key to North American Birds」
...Similar to , but with much longer andmore deeply forked tail, larger feet, shorter bill, andvery broad dusky tips to the upper tail coverts...
Frank M. Chapman 「Color Key to North American Birds」
...Under wing coverts and axillars pure white...
Frank M. Chapman 「Color Key to North American Birds」
...Under tail coverts pure white...
Frank M. Chapman 「Color Key to North American Birds」
...The wing-bars in the true rock-pigeon and in the chequered variety are, in fact, due to similar though larger spots symmetrically crossing the secondary wing-feather and the larger coverts...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...They are lively, happy little workers, and on grouse in dense coverts, no dog possesses a better nose for the purpose...
Oliver Hartley 「Hunting Dogs」
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