Sparrows trying to be Swallows

With the warmer weather we are now getting quite a few flies over the lakes and rivers.  This week I noticed house sparrows hunting mayflies over the Kennet near Kings Point, something that I remember also seeing last summer.  They perch on the railings that run alongside the river, and when they see a suitable fly, they launch themselves out across the river, snapping at the fly, landing on the railings on the other side with it in their beak, if they are lucky.