Seven ornate sea slugs with feathery red, orange, gold and cream frills arranged on a white background, a natural-history plate by Ernst Haeckel.

A single small red and cream sea slug with feathery gills on a white background. — Inside: four of your photos stand up below this, with your note.

No. 27 of 248 · The Natural History Series

Sea Slugs

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Seven frilled sea slugs curl across the cover in coral red, gold and cream, from Ernst Haeckel's Art Forms in Nature. Haeckel, a German zoologist, drew sea creatures as symmetrical ornament, and his plates went on to inspire Art Nouveau. For someone who loves the strange beauty of the sea.

Add four of your own photos and your own words; we print the card in the US and post it for you.

On the back

From the great natural-history books of the 1700s to the 1900s / SEA SLUGS / Nudibranchia / Sea slugs are among the most colourful animals in the sea. Their colours warn fish that they taste bad, and some keep the stinging cells of the jellyfish they eat. / Kunstformen der Natur (Art Forms in Nature), 1899-1904 / Ernst Haeckel, the German zoologist, drew sea creatures as symmetrical ornament; his plates inspired Art Nouveau.

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