Skliss

Sklisses, Sklizes, Flying Cows or Bos sklissus are a non-sapient mammalian species from the planet of Sheshineru in the Milky Way galaxy.

Biology
Sklisses are ruminant herbivores with long, webbed, purple translucent wings on their backs. Their appearance is similar to that of an Earth cow. Sklisses moves most of the time on its feet. They don't fly very fast, are somewhat clumsy, get tired quite quickly and land. In the wild on their home planet of Sheshineru, Sklisses use flight to fly across rivers and difficult terrain to new pastures. Locals graze squisses like earthlings do cows and sheep. Sklisses feed on grass (both alien and terrestrial), hay and plant leaves.