It is sometimes mistaken for a Dall's porpoise, but it is actually a Pacific white-sided dolphin, with a dorsal fin that resembles the blade of a sickle.

The maximum is about 7 to 8 years. However, very few sardines live this long in the harsh natural world. Most are eaten by other creatures.

Noboribetsu Marine Park Nixe opened on July 20, 1990.

There are five species of wild seals that can be seen in Japan: bearded seal (Erignathus barbatus), ringed seal (Pusa hispida), spotted seal (Phoca largha), Harbor seal (Phoca vitulina), and ribbon seal (Histriophoca fasciata).
In Japan, these seals can basically only be seen in Hokkaido.

Hermit crabs that live on land have remnants from when they were in the water, and breathe through their gills and abdominal skin. They can only breathe in moist places.