They stay still in the cold deep sea to conserve energy as much as possible.

Gentoo penguins are the fastest swimmers among penguins. The average speed of king penguins is about 8 km/h.

It is called “gaya” because it can be caught in large numbers.
*Hurly-burly is expressed as wai-wai-gaya-gaya in Japanese.

It is said that it is the closest to spiders in terms of classification.

The melon organ is made up of fatty tissue, not brain.
It is so called because this fatty tissue resembles the appearance of a melon.
It acts like a lens that converges sound in one direction & radiates it forward.