Bats now deserve some new levels of respect. Like their fellow Cave dweller the Megalania, they have a chance to infect you with Mega Rabies (though only a chance rather the 100% like Megalania)
They are easy to spot and avoid using bug repellent. But due to the new Biological weapon element of them. Engage at a distance where possible. Fight them with sword and pike only as a last resort. Make sure you have a stock of Antidotes or Wyvern Milk before any Splunking
I didn't see any tip on fighting these annoying creatures. I would recommend carrying a shot gun on you. Preferably an Apprentice or higher. Many people like the pump action for the bigger clip, but simple shitty does more damage. Way until close for more damage dealt.
Be rly carefull.. in caves these guys are extremly Annoying to encounter, they Will have a 10% chance to infect you, when they did you are Almost guarenteed to die. If you and your tribemate are infected, stay away from eachother. The only way to survive is have lots of healing brews or the antitode.... Screw onycs they destroyed my cave experience...
If encountered outside of a cave near a coast, especially early game, simply get it/them to start chasing you. Then run straight out into the water until one lands it's first hit. Then dive underwater and circle around, staying underwater, back to the coast. They don't wander so they will stay stuck out over the water where they lost track of you.