There is lore behind the diferent looks of the Miqote tribe. Suns are diurnal and Moons are nocturnal. Their eyes developed differently to suit the environment they live in. Slit eyes filer out light better for daytime and round pupils can expand more to let in more light which is need for night vision. Probably the fangs and tails are also evolutionary responses. Mashing the two up would make no sense.

As a species, the Miqo'te have diverged into two seperate race cultures; the Seekers of the Sun and the Keepers of the Moon.

The Seekers of the Sun worship the goddess of the sun, Azeyma the Warden, and their culture revolves around the inclusion of the sun in their daily lives; becoming known as the diurnal clan of the Miqo'te race; active during the day.

The Keepers of the Moon are nocturnal. Shying from the garish light of day, they revel in the shroud of night, and offer their piety to Menphina the Lover, goddess of the moon.
The Keepers of the Moon also have a custom of applying war paint to their faces; as it is believed the vivid colors grant lunar powers.

Physiology

Due to the differences of their cultures, there are some physical difference between the Seekers of the Sun and the Keepers of the Moon.

Due to their exposure to light, the pupils of a "Seeker of the Sun" are vertically aligned slits with irises become feintly coloured. It is also not uncommon for their eyes to be disparately coloured from birth, a trait considered auspicious amongst their kind.

In contrast, due to their exposure to darkness, the pupils of a "Keeper of the Moon" are large and round, with very little iris exposure. They are distinguishable from their diurnal cousins by their darker fur, larger ears, rounder eyes, more pronounced canines, and longer, skinnier tails. Both groups share a superb sense of smell and powerful leg muscles, results of a long evolution geared towards hunting and predation.