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purple martin dawnsong rar torrent

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Hash :91FB2C2BE29157670816672E646BFD8237843643
Added :1 Year+ in Music - Music
Size :66.86 MB
Stream :Watch Online Full Movie @ Movie4u
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purple martin dawnsong rar torrent
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     purple martin dawnsong.rar -
66.86 MB


The Purple Martin Conservation Association is excited to announce the availability of the most unique accessory yet
developed for attracting martins: a 60-minute cassette of Purple Martin Dawnsong. Dawnsong is the unique set of
vocalizations that adult (ASY = "after-second-year") male martins emit during the predawn hours of spring
while flying high above their colony sites or while perched nearby. It is a loud, continuous series of chirps presented
in a syncopated series of about seven to nine notes repeated over and over. Its function is the attraction of
nocturnally-migrating subadult (SY = "second year" or yearling) martins to a singing male's colony site.
Dawnsinging is not a group chorus. Each male flies his own path in slow, wide circles about 500 feet up, singing his own unique song. It is estimated that the sounds from a morning of dawnsong project across at least 30 square miles of ground and perhaps 100 cubic miles of air, as early morning acoustics are the best for sound transmission.
By attracting more colony members, a dawn-singing male is attempting to leave more offspring during a single summer's breeding effort by increasing his opportunity of engaging in forced extrapair copulation with the mates of the subadult males he attracts. Since the migration of subadults lags behind that of the earliest adults by at least 4-6 weeks, adult males don't begin their dawnsinging until about the time that subadults begin migrating through their area.

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