These are C. elegantissima of the cold North Pacific (at least north to the Gulf of Alaska; the Beaufort Sea is inhabited by C. limacina), C. okhotensis of the Okhotsk Sea (where it overlaps with C. elegantissima), and C. antarctica of Antarctic waters.

[10] C. limacina swims by beating its two wings to move upwards or maintain itself at a constant depth.

[9] Clione limacina is a prey of planktonic feeders, such as the baleen whales,[8] which historically led to sailors naming it "whale-food".

[8] For example, the Chum Salmon, Oncorhynchus keta, is a major predator of sea angels.

[16] While sea angels are relatively obscure in Western countries, they are extremely well-known in Japanese culture.

[17] However, Californian band glass beach seems to use a drawing of a Clione in the album cover for Plastic Death.

This article incorporates CC-BY-SA-3.0 text from the reference [5] Media related to Clione limacina at Wikimedia Commons