Japan Underwater Photo Contest 2020 Winners

Gold Medal winner: "Survival," a photo capturing a butterflyfish feeding on spawning corals in Yakushima, Kagoshima
Gold Medal winner: "Survival," a photo capturing a butterflyfish feeding on spawning corals in Yakushima, Kagoshima

From October to Novem­ber of 2020, the Japan National Tourism Organ­ization (JNTO) held its second annual Japan Underwater Photo Contest, seeking photos taken by divers that showcase the undiscovered beauty and artistry of diving in Japan to the world.

Researchers pick up nine new calls made by Weddell seals

Most of these sounds were measured at more than 21 kHz, which is beyond the range of human hearing of 20 to 20,000 hertz. A particular high-pitched whistle came in at 49.8 kHz. When the seals harmonised multiple tones, the resultant sound may exceed 200 kHz, which is beyond what even cats and dogs can hear).

The discovery was the subject of a paper published online in the journal The Journal of the Acoustical Society of America.