The black-throated loon was one of the many species originally described by Linnaeus in his 18th-century work, Systema Naturae. The genus name Gavia comes from the Latin for "sea mew", as used by ancient Roman naturalist Pliny the Elder.
This species, like all divers, is a specialist fish-eater, catching its prey underwater. It flies with neck outstretched. It feeds on fish, insects, crustaceans and amphibians.
The calls include a yodelling high-pitched wail and harsh growls, similar but lower pitched than Pacific loon.
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