They are bats. As customary in real life, you have to let them pee into your mouth in order for you to befriend them. Then, after they are tamed, they are able to suck the life force out of every animal in the game except troodons and microraptors. When it sucks out the dino's life force, the dino is instantly killed. I believe they are very overpowered.
Love the cover art ISSA masterpiece and I look forward to this guy in caves wich is where I plan to find them just hope the onyx don't come with it imagine death rabies and blood loss will make the caves a terrifying place
In info it said “Note, the official imagery is not available. An artist has a rendition using all available information to create a REALISTIC version of the creature (the in-game creature may look SLIGHTLY different.”
When encountering you will want to stay a ways back. It will probably have a far agrro area so you will need to stay back and shoot it. It will likely be with onycs to so you will have blood loss and tons of angry bats. It will reside in caves and will be like a vampire bat so watch out. It will stay away from but it may be stronger than the onyc so it leads me to believe it may fight titanaboa cause it is the apex predator of onyc so the desmodus will fight it cause the titanaboa thinks desmodus is onycs. There