It is called nuptial color, which looks yellow or golden. This is how they show off their presence.

Penguins are flightless birds, or avifauna. They used to fly in the past, but it is thought that they evolved and stopped flying. Instead, they became good at swimming & diving.

About 95-97% of their body is made up of water.

Spotted garden eel (Heteroconger hassi) are waiting for food with their faces out of the sand. By keeping their bodies facing the direction of the current, they can catch food efficiently.

Sanderia malayensis eat other jellyfish & small fish.