ces of a dozen or more of these pretty little birds； that often sing together； afford something approaching a musical treat。
WILSON'S WARBLER （Sylvania pusila） Wood Warbler family
Called also： BLACKCAP； GREEN BLACK…CAPPED WARBLER； WILSON'S FLYCATCHER
Length 4。75 to 5 inches。 About an inch and a half shorter than the English sparrow。 Male Black cap； yellow forehead； all other upper parts olive…green； rich yellow underneath。 Female Lacks the black cap。 Range North America； from Alaska and Nova Scotia to Panama。 Winters south of Gulf States。 Nests chiefly north of the United States。 Migrations May。 September。 Spring and autumn migrant。
To see this strikingly marked little bird one must be on the sharp lookout for it during the latter half of May； or at the season of apple bloom； and the early part of September。 It passes northward with an almost scornful rapidity。 Audubon mentions having seen it in Maine at the end of October； but this specimen surely must have been an exceptional laggard。
In common with several others of its family； it is exceedingly expert in catching insects on the wing； but it may be known as no true flycatcher from the conspicuous rich yellow of its under parts； and also from its habit of returning from a midair sally to a different perch from the one it left to pursue its dinner。 A true flycatcher usually returns to its old perch after each hunt。
To indulge in this aerial chase with success； these warblers select for their home and hunting ground some low woodland growth where a sluggish stream attracts myriads of insects to the boggy neighborhood。 Here they build their nest in low bushes or upon the ground。 Four or five grayish eggs； sprinkled with cinnamon…colored spots in a circle around the larger end； are laid in the grassy cradle in June。 Mr。 H。 D。 Minot found one of these nests on Pike's Peak at an altitude of 11；000 feet； almost at the limit of vegetation。 The same authority compares the bird's song to that of the redstart and the yellow warbler。
YELLOW REDPOLL WARBLER （Dendroica palmarum hypochrysea） Wood Warbler family
Called also： YELLOW PALM WARBLER； ＇the two former palm warbler species combined as PALM WARBLER； AOU 1998＇
Length 5。5 to 5。75 inches。 A little smaller than the English sparrow。 Male and Female Chestnut crown。 Upper parts brownish olive； greenest on lower back。 Underneath uniform bright yellow； streaked with chestnut on throat； breast； and sides。 Yellow line over and around the eye。 Wings unmarked。 Tail edged with olive…green； a few white spots near tips of outer quills。 More brownish above in autumn； and with a grayish wash over the yellow under parts。 Range Eastern parts of North America。 Nests from Nova Scotia northward。 Winters in the Gulf States。 Migrations April。 October。 Spring and autumn migrant。
While the uniform yellow of this warbler's under parts in any plumage is its distinguishing mark； it also has a flycatcher's trait of constantly flirting its tail； that is at once an outlet for its superabundant vivacity and a fairly reliable aid to identification。 The tail is jerked； wagged； and flirted like a baton in the hands of an inexperienced leader of an orchestra。 One need not go to the woods to look for the restless little sprite that comes northward when the early April foliage is as yellow and green as its feathers。 It prefers the fields and roadsides； and before there are leaves enough on the undergrowth to conceal it we may come to know it as well as it is possible to know any bird whose home life is passed so far away。 Usually it is the first warbler one sees in the spring in New York and New England。 With all the alertness of a flycatcher； it will dart into the air after insects that fly near the ground； keeping up a constant chip； chip； fine and shrill； at one end of the small body； and the liveliest sort of tail motions at the other。 The pine warbler often bears it company。
With the first suspicion of warm weather； off goes this hardy little fellow that apparently loves the cold almost well enough to stay north all the year like its cousin； the myrtle warbler。 It builds a particularly deep nest； of the usual warbler construction； on the ground； but its eggs are rosy rather than the bluish white of others。
In the Southern States the bird becomes particularly neighborly； and is said to enter the streets and gardens of towns with a chippy's familiarity。
Palm Warbler or Redpoll Warbler （Dendroica palmarum） differs from the preceding chiefly in its slightly smaller size； the more grayish…brown tint in its olive upper parts； and the uneven shade of yellow underneath that varies from clear yellow to soiled whitish。 It is the Western counterpart of the yellow redpoll； and is most common in the Mississippi Valley。 Strangely enough； however； it is this warbler； and not hypochrysea； that goes out of its way to winter in Florida； where it is abundant all winter。
YELLOW WARBLER （Dendroica aestiva） Wood Warbler family
Called also： SUMMER YELLOWBIRD； GOLDEN WARBLER； YELLOW POLL
Length 4。75 to 5。2 inches。 Over an inch shorter than the English sparrow。 Male Upper parts olive…yellow； brightest on the crown； under parts bright yellow； streaked with reddish brown。 Wings and tail dusky olive…brown； edged with yellow。 Female Similar； but reddish…brown streakings less distinct。 Range North America； except Southwestern States； where the prothonotary warbler reigns in its stead。 Nests from Gulf States to Fur Countries。 Winters south of the Gulf States。 As far as northern parts of South America。 Migrations May。 September。 Common summer resident。
This exquisite little creature of perpetual summer （though to find it it must travel back and forth between two continents） comes out of the south with the golden days of spring。 From much living in the sunshine through countless generations； its feathers have finally become the color of sunshine itself； and in disposition； as well； it is nothing if not sunny and bright。 Not the least of its attractions is that it is exceedingly common everywhere： in the shrubbery of our lawns； in gardens and orchards； by the road and brookside； in the edges of woods everywhere we catch its glint of brightness through the long summer days； and hear its simple； sweet； and happy song until the end of July。
Because both birds are so conspicuously yellow； no doubt this warbler is quite generally confused with the goldfinch； but their distinctions are clear enough to any but the most superficial glance。 In the first place； the yellow warbler is a smaller bird than the goldfinch； it has neither black crown； wings； nor tail； and it does have reddish…brown streaks on its breast that are sufficiently obsolete to make the coloring of that part look simply dull at a little distance。 The goldfinch's bill is heavy； in order that it may crack seeds； whereas the yellow warbler's is slender； to enable it to pick minute insects from the foliage。 The goldfinch's wavy； curved flight is unique； and that of his 〃double〃 differs not a whit from that of all nervous； flitting warblers。 Surely no one familiar with the rich； full； canary…like song of the 〃wild canary；〃 as the goldfinch is called； could confuse it with the mild 〃Weechee； chee； cher…wee〃 of the summer yellowbird。 Another distinction； not always infallible； but nearly so； is that when seen feeding； the goldfinch is generally below the line of vision； while the yellow warbler is either on it or not far above it； as it rarely goes over twelve feet from the ground。
No doubt； the particularly mild； sweet amiability of the yellow warbler is responsible for the persistent visitations of the cowbird； from which it is a conspicuous sufferer。 In the exquisite； neat little matted cradle of glistening milk…weed flax； lined with down from the fronds of fern； the skulking housebreaker deposits her surreptitious egg for the little yellow mother…bird to hatch and tend。 But amiability is not the only prominent trait in the female yellow warbler's character。 She is clever as well； and quickly builds a new bottom on her nest； thus sealing up the cowbird's egg； and depositing her own on the soft； spongy floor above it。 This operation has been known to be twice repeated； until the nest became three stories high； when a persistent cowbird made such unusual architecture necessary。
The most common nesting place of the yellow warbler is in low willows along the shores of streams。
YELLOW…BREASTED CHAT （Icteria virens） Wood Warbler family
Called also： POLYGLOT CHAT； YELLOW MOCKING BIRD
Length 7。5 inches。 A trifle over an inch longer than the English sparrow。 Male and Female Uniform olive…green above。 Throat； breast； and under side of wings bright； clear yellow。 Underneath white。 Sides grayish。 White line over the eye； reaching to base of bill and forming partial eye…ring。 Also white line on sides of throat。 Bill and feet black。 Range North America； from Ontario to Central America and westward to the plains。 Most common in Middle Atlantic States。 Migrations Early May。 Late August or September。 Summer resident。
This largest of the warblers might be mistaken for a dozen birds collectively in as many minutes； but wh