Glaucilla marginata: Beautiful blue dragon nudibranchs (sea slugs) | The Kid Should See This https://thekidshouldseethis.com/post/glaucilla-marginata-nudibranchs
Glaucilla marginata, are blue sea slugs or nudibranchs — soft-bodied marine gastropod molluscs — found floating in warm oceanic waters,
the Surf Zone” on the far south coast of New South Wales