The Nudibranch mascot is based on the Black Nudibranch, which is a type of oceanic sea slug. It has a black body with a turquoise marginal line, black rhinophores (antennae) on its head, and turquoise tail prongs at the rear. The Nudibranch mascot also has orange eyes.
The Nudibranch mascot appears to swim. It flattens itself as it glides and its rhinophores and prongs stand up. When standing still, its body is higher and the rhinophores and prongs are bent. As it moves, the Nudibranch makes a squishy noise and clicking sounds. Bubble sounds characteristic to all Ocean terrains in Crossy Road can also be heard. The Nudibranch emits bubbles as it moves and these disappear quickly. When the Nudibranch dies, it releases a spray of bubbles. If the Nudibranch delays too long or retreats too far, it is swallowed by a large whale.
Nudibranchs are a group of soft-bodied, marine gastropod mollusks which shed their shells after their larval stage. They are noted for their often extraordinary colors and striking forms.
To identify prey, they have two highly sensitive tentacles, called rhinophores, located on top of their heads. Nudibranchs derive their coloring from the food they eat, which helps in camouflage, and some even retain the foul-tasting poisons of their prey and secrete them as a defense against predators.
The eyes of a nudibranch are imbedded in the skin of their head, NOT on the top of their stalks like a snail’s eyes.
The Nudibranch mascot in Crossy Road is most likely a Black Nudibranch (Tambja capensis) which is a large (up to 80 mm) deep-bodied nudibranch endemic to South African coast. It is easily recognized because of its blue-black color and bright turquoise marginal line. Its gills and rhinophores are also black. It appears the orange eyes and turquoise tail prongs are for a graphic effect.