Sentinel species are animals, plants, or microorganisms that help detect environmental hazards before they threaten human health or ecosystems. The classic example is the canary in a coal mine, where birds were used to warn miners of toxic gases. Today, mussels help monitor water pollution, frogs indicate environmental changes, honeybees reveal potential pesticide exposure, and emperor penguins help scientists study climate change. These natural indicators remind us that the health of wildlife is closely connected to our own. Sometimes, nature warns us before we recognise the danger.
https://www.thehindu.com/sci-tech/science/what-are-sentinel-species/article70853746.ece
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