Glaucus atlanticus: Do you know what kind of bird?

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Glaucus atlanticus (common names sea swallow, blue glaucus, blue sea slug and blue ocean slug) is a species of medium-sized blue sea slug, a pelagic aeolid nudibranch, a marine opisthobranch gastropod mollusk in the family Glaucidae. This is the only species in the genus Glaucus,[1] but is closely related to Glaucilla marginata, another member of the family Glaucidae.
 




Description

The normal size of this species is between 5 and 8 cm in length. It is silvery grey on its dorsal side and dark and pale blue ventrally. It has dark blue stripes along the edge of its foot. It has a tapering body which is flattened and has six appendages which branch out into rayed cerata.[2]:42-43

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