Magnus Lundgren / Wild Wonders of China / Ragged sea hare (Bursatella leachii) Pak Lap Tsai, Sai Kung, Hong Kong, China.

Magnus Lundgren / Wild Wonders of China / Pygmy sea hare (Aplysia parvula) Pak Lap Tsai, Sai Kung, Hong Kong, China.

Jean E. Roche / Mottled sea hare (Aplysia fasciata) Salin de Giraud, Camargue, France.

Tony Wu / Close-up view of strands of multicolored Sea hare eggs (Aplysia sp.) Hiwasa, Japan, May.

Pal Hermansen / Sea ice in shape of a hare or rabbit, Nunavut, Canada, August.

Alex Mustard / Geographic sea hare (Syphonota geographica) swimming using its parapodial lobes as flapping wings. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Florian Möllers / Common European hare (Lepus europaeus) on the sand dunes of the Island of Sylt, Wadden Sea National Park, UNESCO World Heritage Site, Germany, June.

Florian Möllers / Common European hare (Lepus europaeus) on the sand dunes of the Island of Sylt, Wadden Sea National Park, UNESCO World Heritage Site, Germany, June.

Florian Möllers / Common European hare (Lepus europaeus) on the sand dunes of the Island of Sylt, Wadden Sea National Park, UNESCO World Heritage Site, Germany, June.

Claudio Contreras / Lined sea hare (Stylocheilus striatus), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

MYN / Sheri Mandel / California brown sea hare (Aplysia californica), Malibu, California, USA, May, meetyourneighbours.net project

Christophe Courteau / Sea hare {Aplysia punctata} Brittany France