I received this by email just this morning. The tormenting rainfall has grounded 44 Common Swift at Klein's Camp - Serengeti. http://www.birdinfo.co.za/landbirds/11_european_swift.htm
It happened before, that after tormenting rainfall, Common Swifts were found on the ground, dead or dying.
Common Swift live their life on the wing (24/7), they only touch the "ground" during their breeding season in Europe (end of April - mid September).
Common Swift is not able to take-off from ground level.
They build their nests under the upper roof-tiles of a steep roof or in holes in high walls. They need about 3 meters free downfall to fly off.
I'm always very pleased to read about people who help those grounded Common Swifts to recover and get airborne again!