Credit: PETER MATULAVICH/SCIENCE PHOTO LIBRARY

Caption: Purple martins (Progne subis), the largest North American swallows, skim over reeds during pre-migratory roost in Ohio. Pre-migratory roosts are large communal gatherings that occur on large lakes in late summer before the birds start their migration to South America. Birds may use the roost for several weeks. There are dozens of known roosting sites in the eastern half of North America and the largest contain tens and even hundreds of thousands of birds.

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Keywords: bird, eat, feed, flies, fly, lake, migrate, migration, north america, ohio, pre-migratory, progne subis, purple martin, purple martins pre-migratory roost, roost, skim, swallow

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Purple martins pre-migratory roost

K002/1874 Rights Managed

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Duration: 00:00:13.1

Frame size: 640x480

Frame rate: 29.97

Audio: No

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

File size: 115.4M

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Capture format: Betacam SP

Frame size: 720x486

Codec: Uncompressed 8-bit 4:2:2

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