Swift
Study site
 | We investigate a swift colony located in a federal highway bridge near the city of Olpe (spanning the Bigge Reservoir, North Rhine-Westphalia). |
| Swifts breed within 16 large hollow chambers running beneath the carriageway (chamber size: l x w x h = 45 m x 4.5 m x 2.5 m). They enter the chambers by ventilation holes in the chambers’ floor. |  |
| In the immediate vicinity to these ventilation holes, the swifts build their nests with materials collected from the air during flight. |
