Shelters are the proverbial canary in the coalmine for their communities. (animalsheltering.org)
In many ways Iceland is the tip of the iceberg — the proverbial canary in the coalmine showing the need to better cope with over-indebted economies. (michael-hudson.com)
Test scores canary in the coalmine at Auer Avenue and dozens of schools like Auer. (stopmpstakeover.com)