It can turn invisible at night and while it is latched upside down during both night and day. Every time it bites a creature, it adds blood packs to it's inventory, making it good to use to tame bloodstalkers. It collects tons of spoiled meat when it eats corpses making it also good for narcotic farming. It has echolocation which allows it to ping all nearby creatures, and finally it has the ability to dive similar to the griffin and snow owl. It's tamed passively by putting blood packs in the last slot of your hotbar and letting it pick you up.
Get a good pteranodon, build a trap made of double doorways and a gate in the front, use the pteranodon to lure the bats into the trap(Pteranodons can fit through double doorways but bats can’t) net gun all the bats, close the gate, kill the low level bats, then tame the one you want.
Pretty important to note that in order to receive the extra levels for efficiency you need to "feed" it a passive small creature before/ during the taming process. Each time it feeds on you it loses efficiency I don't know what tame is best used but I am using a Moschops and it is working well.