Always wanted to do this but until I found a client who wanted something similar I just never found the right incentive...now My client's idea and mine, while similar, are still different in many ways...and honestly....neither is that original. So without further adue...
The giant black bats of Debras 4 also known as "Night Terrors" are unique for a singular reason...they're the most massive ever recorded. With a wingspan of nearly 45 feet they are as large as some aircraft. They possess all of the normal abilities of their diminutive cousins such as excellent night vision and a remarkable sense of smell, but unlike other fruit bats they also possess echolocation which scientists believe help them navigate the colossal caverns where they dwell. What truly sets them apart is how docile they are. These bats are a variety of fruit bats although due to the nature of their diet they have similar facial characteristics (including fangs and incisors)of vampire bats. They subsist almost entirely on the giant Loardra fruits which grow on massive towering trees that reach nearly a thousand feet in height, the fruit of which must be coaxed out much as vampire bats cause blood to flow. They have also been knwon to feed upon the various giant, half meter long, insects that frequent those very trees. With literally no competitors to speak of and virtually no natural predators save fort Dragons who find them particularly delicious, this natural order prevents their numbers from skyrocketing out of control. It is possible to tame them for use as a mount but the care and feeding of these great beasts make that an expensive endeavor. In combat they are not particularly fierce having no real natural weapons of significance, but like all animals they can bite and have nasty claws but for the most part prefer to flee from combat. As mounts they can be trained to tolerate weaponry and combat conditions but are best suited for less dangerous roles such as reconnaissance especially since they can fly without making hardly a sound. They are otherwise identical to their non-marsupial cousins in every other way.