These things are rare but one was near my newly made camp and I collect their poop daily for my plants. But if this thing is coming for you use fast travel don’t use your flyers mine got one-shot by a titanosaur as I try to escape it. To fight this thing solo try spraying down from a quetzal (has to be out of the titanosaur’s range) with dodos attached to c4s or for starters just guns. Here is another way try knocking them out and send all your tames to attack it but it’s not worth it to kill one.