When the sun goes down, the core glows its brightest. Many Staryu will float from the seafloor to the surface and align themselves with stars of the night sky as their core flickers, displaying a connection with the celestial bodies of space. The anime has shown that if Staryu becomes weak, its core will grow faint and flash slowly. During the ends of summer, groups of Staryu tend to gather while lighting up in a steady rhythm. Staryu can be found at the very bottom of the ocean on the seafloors.