Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea) on sea floor. Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea) on sea floor. Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Sergio Hanquet / Green ormer (Haliotis tuberculata coccinea). Tenerife, Canary Islands.

Niall Benvie / Little girl with shell pressed to her ear, listening to the sea, on the beach, Scotland, UK. Model released

Willem Kolvoort / Ear snail (Lymnaea auricularia} carrying eggs of another Ear snail on its shell, Holland

Paul D Stewart / Illustration of tribal chief with Macaw (Ara sp.) feather ornaments. Early Lithographic print by Brodtmann, from Dr. Shinz, 'Naturgeschichte und Abbilldungen der Saugethiere' 1827/1840, with hand colo...

Joel Sartore / Photo Ark / Bare-tailed woolly opossum (Caluromys philander) female sniffing and listening, Shell Factory Nature Park. Captive.

Chris Shields / Illustration of Big-ear radix (Lymnaea auricularia)