Caption: Thousands of purple martins (Progne subis), the largest North American swallows, fly off transmission tower and power lines to reed bed in nearby lake to sleep during pre-migratory roost in Ohio. Pre-migratory roosts are large communal gathering that occur on large lakes in late summer before the birds start their migrations to South America. Birds may use the roost for several weeks. There are dozens of known roosting sites in the eastern U.S. alone and the largest contain tens and even hundreds of thousands of birds.

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Keywords: animal, bird, birds, electricity pylon, flock, flocking, fly, flying, gather, gathering, hydro tower, ironman, migrate, migrating, migration, north america, power lines, pre-migratory, progne subis, purple martin, roost, roosting, swallow, transmission tower, zoology

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Purple martins fly off transmission tower

K003/6732 Rights Managed

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Duration: 00:00:11.21

Frame size: 1920x1080

Frame rate: 29.97

Audio: Yes

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 531.1M


Capture format: DSLR - AVCHD

Codec: Apple ProRes 422 (HQ)

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