couple of house martin building nest

bird animal wing beak wildlife seabird blue white sand gull waterbird pet shorebird flight sea wall finch snow delichon urbicum aka common house martin pair martins building nest bellow roof birds nesting residential areas people destroy nests couple animal asian martin background beach beak beautiful bird birds birdwatching black brown nest coast common delichon urbicum environment europe fauna feather flight fly jiricka obecna martins natural nature ocean ornithology outdoor sand sea seagull shore sky species spring summer swallow swallow swallow's water white wild wildlife wing wings