Three billion birds in the US and Canada have vanished since 1970, surveys show

Science magazine

North America's birds are disappearing from the skies at a rate that's shocking even to ornithologists. Story here.

Birds ranging from the iconic meadowlark (l.) to the common house sparrow (below) are being hit. PinP photos.

On World Migratory Bird Day, UN Calls for Greater Protection of Habitats

United Nations News Centre

Yellow-headed blackbird. PinP photo.

As an estimated 50 billion birds commence their annual migrations, the critical staging areas they need to complete these journeys continue to be degraded or are disappearing completely, the United Nations today warned on this year's World Migratory Bird Day. Details here.

Brush-clearing on a Manitoba farm. PinP photos.