Life histories of North American wood warblers, Part 1 (of 2)Bent, Arthur Cleveland
Science
Life histories of North American wood warblers, Part 1 (of 2)
Bent, Arthur Cleveland
Birds -- North America; Passeriformes; Wood warblers
_Plumages._--Dr. Dwight (1900) calls the natal down "brownish
mouse-gray," and describes the juvenal plumage as follows: "Whole body
plumage and the wing coverts cinnamon, palest on the abdomen. Wings and
tail olive-brown edged with olive-green. Two indistinct lateral crown
stripes brownish mouse-gray. A transocular streak dusky." Ridgway's
(1902) description is somewhat different: "Head, neck, and under parts
buff, the pileum with two broad, but strongly contrasted, lateral
stripes of wood brown or isabella color; a postocular streak of the same
color; back, scapulars, rump, and upper tail-coverts wood brown or
isabella color; wing-coverts light buffy olive, the middle and greater
broadly but not sharply tipped with cinnamon-buff; remiges and rectrices
grayish olive-green, as in adults." Young birds seem to vary
considerably in the color of the upper parts.
A partial postjuvenal molt occurring in late June or early July involves
all the contour plumage and the wing coverts but not the rest of the
wings or the tail. The young bird in its first winter plumage is
practically indistinguishable from the adult at that season, except for
the juvenal wings, in which the tertials are lightly tipped with rusty
brown.
There is apparently no spring molt, but a complete postnuptial molt
occurs in July. Spring birds are slightly paler, grayer and less buffy
than in the fall. The sexes are practically alike in all plumages.
_Food._--As I have said, the name worm-eating warbler seems to be
somewhat of a misnomer for this bird. Edward H. Forbush (1929) writes:
"I find no records of any consumption of earthworms by this species,
which although a typical ground warbler spends some of its time hunting
among the branches of trees, where it finds span-worms. It also hunts on
the ground in damp places frequented by army-worms. Nevertheless these
are not worms but caterpillars. Probably, however, in its perambulations
and peregrinations upon the surface of the earth the bird now and then
does pick up a small earthworm, for earthworms form a staple food for
many birds when the ground is moist."
Arthur H. Howell (1924) says: "Little is known of the food of this
species, but it seems doubtful whether it lives up to its name of
worm-eater.' Two stomachs of this bird from Alabama contained remains of
weevils, beetles, bugs, caterpillars, and Hymenoptera." Howell (1932)
further reports: "The stomachs of three individuals taken in Florida in
April contained small grasshoppers, caterpillars, sawfly larvae,
beetles, and spiders. One dragon-fly, one bumblebee, and one 'walking
stick' were also included in the contents." Professor Aughey (1878)
included the worm-eating warbler among the birds seen catching locusts
in Nebraska.
_Behavior._--Brewster (1875) gives the best account of the activities of
the worm-eating warbler as follows:
Public-domain text, read in full here on John Shaqi.
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