Purple martins pre-migratory roost
Référence de la vidéo 11924768
| Thousands of purple martins (Progne subis), the largest North American swallows, form a living tornado 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. | |
| Licence : | Droits gérés |
| Crédit : | Science Photo Library / Matulavich, Peter |
| Model Release : | Non requis |
| Property release : | Non requis |
| Durée : | 22 Secondes |
| Aspect ratio : | 4/3 |
| Restrictions : | - |
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