About: http://webisa.webdatacommons.org/286254569

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Because they are extremely sensitive to pollution and environmental change, frogs have been seen as a sort of early warning sign ??? the proverbial canary in the coal mine ??? indicating that ecosystems are in peril.
http://www.w3.org/ns/prov#wasQuotedFrom	hcn.org