Famously, the use of caged birds to alert miners to the invisible dangers of gases such as carbon monoxide gave rise to the cautionary metaphor "canary in a coal mine."
Read the full article on PhysOrg
Canary in a coal mine: Survey captures global picture of air pollution's effects on birds
No replies to this topic
0 user(s) are reading this topic
0 members(s), 0 guests(s) and 0 anonymous member(s)