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
S. A. Forbes (1883) found that a stomach taken from an orchard infested
by canker-worms contained about 80 percent of these destructive larvae
and about 20 per cent beetles. Professor Aughey (1878) observed these
warblers catching young locusts in Nebraska. Clarence F. Smith adds, in
some notes sent to me, that "in the fall, during migration time,
Tennessee warblers often glean their food from dense patches of such
weeds as sunflower, goldenrod, and ragweed," and that "sumac, poison
ivy, and other berries are sometimes eaten in small quantity."
F. H. King (1883) has considerable to say about the damage done to
Delaware and Catawba grapes in Wisconsin; as soon as they are wounded,
they are attacked by ants, bees, and flies and soon destroyed. But he
thinks the service rendered more than compensates for the harm done. He
refers to the feeding habits of the Tennessee warbler as follows:
It is very dexterous in its movements, and obtains the greater part of
its food upon and among the terminal foliage of trees. Titmouse-like, it
often swings pendant from a leaf while it secures an insect which it has
discovered. Small insects of various kinds, not especially attractive to
larger birds, are destroyed by this species in large numbers; and its
slender, acute bill serves it much better in picking up these forms than
a heavier, more clumsy one could. * * * Of thirty-three specimens
examined, two had eaten two very small hymenoptera (probably parasitic);
seven, thirteen caterpillars; three, fifteen diptera; six, thirteen
beetles; three, forty-two plant-lice, among which were two specimens of
the corn plant-louse _Aphis maidis_ (?); three, thirty-five small
heteroptera, .09 of an inch long; and one, eleven insect eggs.
Alexander F. Skutch has sent me the following interesting notes on the
feeding habits of the Tennessee warbler in Central America: "I was
surprised to find last month [March] that these warblers were visiting
my feeding shelf on the guava tree in the yard. About the only food I
ever serve to the birds on this table is bananas and occasionally
plantains; and my chief guests are tanagers of about half a dozen
brilliant kinds, a few finches, honeycreepers, and wintering Baltimore
orioles. But the Tennessee warblers soon formed the habit of visiting
the table and sharing the food with the bigger resident birds.
"Some seemed to linger in the vicinity much of the day, making frequent
visits to the board and each time eating liberal portions of banana or
the somewhat harder ripe plantain. They were intolerant of each other,
and one individual would not let a second alight on the board until it
had finished its own meal, although there was plenty of room and plenty
of food for all. I have noticed also that the Tennessee warblers chase
each other as they forage among the trees in wintering flocks. I cannot
recall ever having seen any other wood warbler eat banana.
Public-domain text, read in full here on John Shaqi.
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