Amphimorpho are a fictional open species created by TuxedoDragon

From their website:

A basal form amphimorpho resembles a mammalian creature with a long, serpentine body with 4 or 6 limbs (one or two sets of front limbs and one set of hind limbs), a strong and prehensile tail with a thick base that tapers off towards the end, a head with a round snout lacking nostrils, and rabbit-like ears capable of pivoting independent of each other. Most individuals also possess a belly pouch; this may be a vestigial trait, as it does not appear to serve any vital purpose.