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...re used to assess the health of a particular [[ecosystem]]. They are often sensitive to environmental changes and can provide advance warning of potential probl ...ovide information about the overall health of an ecosystem. They are often sensitive to changes in environmental conditions and can provide early warning signs

...nthic]] feeders, diving to the ocean floor to forage for food, which their sensitive [[whiskers]] help them locate. They eat a variety of [[benthic]] invertebra ...cern by the [[International Union for Conservation of Nature]] (IUCN), but climate change and hunting pose threats to the species.

* [[Blind spot]] - a spot in the field of vision that is not sensitive to light; it is a product of the entrance of the optic nerve into the eyeba * [[Fecal occult blood test]] - a test that uses a piece of chemically sensitive paper to detect blood in a stool sample; used to screen for possible signs