Studies of Birds Killed in Nocturnal Migration — John Shaqi
Studies of Birds Killed in Nocturnal MigrationTordoff, Harrison Bruce
Science
Studies of Birds Killed in Nocturnal Migration
Tordoff, Harrison Bruce
Birds -- Migration
MOLT IN THE TOPEKA SAMPLE.--Our limited findings coincide with those
of Rintoul and Baxter (1914). Body molt was noted in a number of
individuals and species. When present, this molt almost invariably was
in its final stages. One immature male Rose-breasted Grosbeak (October
1) was in heavy body molt. It is perhaps worthy of mention here that
this grosbeak evidently migrates at times in extensive molt. An adult
male (RMM 1102) taken by Mengel near Henderson, Kentucky, on September
9, 1949, was molting plumage of body, wings, and tail, no feather of
the last being longer than one half inch. This remarkable specimen had
only five primaries on one side and four on the other fully
functional. The outermost on the left and two outermost on the right
were from the previous plumage, not yet dropped; the three innermost
of each wing were new and full-length.
In the present sample molt of remiges was noted in one specimen, an
adult female Indigo Bunting (October 1) with outer primaries sheathed
and with molt in progress in the body plumage. The one (immature)
Yellow-breasted Chat in the sample (October 1) had all of its tail
feathers nearly full-length but in quill, possibly as a result of
accident, and two feathers were being replaced also in the tail of an
immature Clay-colored Sparrow (October 6), which was also in body molt
and had some, juvenal feathers on the belly and flanks.
Body molt near completion was further noted as follows: immature male
Yellow-throated Vireo (October 1), adult male Blue-headed Vireo
(October 1), immature female Leconte Sparrow (October 23), several
Lincoln Sparrows (various dates).
Size Differences according to Sex and Age
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