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Sentinel species - Wikipedia
Sentinel Animals - an overview | ScienceDirect Topics
What is a Sentinel Species? - WorldAtlas
Discover 33 Sentinel Species: Why Are They So Important?
Center for Ecosystem Sentinels
Meet the sentinels - Chemical & Engineering News
Sentinel species | biology and environment | Britannica
Animal Sentinels for Environmental and Public Health
Sentinel Species - an overview | ScienceDirect Topics
The Center for Ecosystem Sentinels - Center for Ecosystem Sentinels