The South African highveld gets its summer rain in thundershowers.  The evening following a good shower sees thousands of termites flying off to start new colonies in the soft ground.  This attracts swarms of swallows.  The swallows seem to keep hunting until the termites stop flying.  So how many termites does each swallow then eat?  If they are skilled hunters (which I believe they are), they must be able to catch many more termites than what I would think fits into a swallow's stomach - especially if it wants to keep flying!