Credit: PETER MATULAVICH/SCIENCE PHOTO LIBRARY

Caption: Thousands of purple martins (Progne subis), the largest North American swallows, gathering on transmission tower and power lines near lake during pre-migratory roost in Ohio. The birds fly in from all directions and it is thought they gather here because it is an obvious landmark. Once gathered they will fly off en masse to their roosting site in a nearby reed bed to sleep. 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 gathering on tower

K003/6731 Rights Managed

Downloadable master

Duration: 00:00:16.02

Frame size: 1920x1080

Frame rate: 29.97

Audio: No

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

File size: 733.5M

Original

Capture format: DSLR - AVCHD

Codec: Apple ProRes 422 (HQ)

Please contact Science Photo Library if you require the original, or other formats.

 

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