swallows, scientific name: hirundinidae

bird animal beak wildlife branch finch sparrow wing nature twig shorebird hummingbird blackbird flower robin swallows martins saw-wings hirundinidae family passerine songbirds found world continents including occasionally antarctica highly adapted aerial feeding distinctive appearance scientific name: antarctica appearance small birds dark glossy-blue backs red throats pale underparts long tail streamers extremely agile flight spend time air widespread breeding northern hemisphere migrating south winter swallow numbers fluctuated last years strong regional variation trends