Animal sentinels of poisonous conditions for people have been used for a long time. From the 19th century and well into the 20th century coal miners sent canaries into mining shafts to check if the air was safe to breathe.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/news/monkey-hair-warns-toxicants
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lead
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monkey
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxins
