The expression "a canary in a coal mine" serves as advanced warning of danger, and it is a fitting phrase for a recent study that finds the United States and Canada's massive loss of nearly 3 billion birds, or 29 percent of their bird populations, since 1970.
from Inhabitat - Green Design, Innovation, Architecture, Green Building https://inhabitat.com/us-and-canada-in-drastic-crisis-with-3-billion-birds-lost-since-1970
via Inhabitat
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