red rumped swallow cecropis daurica, hirundo daurica, near a danub delta collecting mud for the nest

animal animals avian background beautiful beauty behaviour bird birds birdwatching breeding brown build cecropis colored daurica daytime environment europe extremadura fauna flight green habitat horizontal isolated lake lesser living material migration migratory natural nature nesting ornithology outdoor outdoors passerine photography portrait red redrumped rumped songbird species striated swallow swallows water wild wildlife