Canaries in mines signaled hazards
Rob Butler, a renowned authority on B.C. birds, is concerned by a troubling downward trend in avian populations worldwide according to the Vancouver Sun.
Population surveys over the past 20 years on the south coast show that olive-sided flycatchers are down 75 per cent, common nighthawks 72 per cent, barn swallows 80 per cent and red-eyed vireos 85 per cent. The list goes on.
Whatever the reason — global warming, habitat loss or other factors — the declines could be part of a much bigger picture.
Outdoor enthusiasts can find more at two new Vancouver Sun blogs: