Be wary-to get their eggs is hard,
Climbing inside the terror mountain,
That might explode and you'll be charred.
Try to use somethimg fast for their offspring,
A bloodstalker, or two.
But beware for they can give you a flare
Killing all of you.
If you get too close to a wild one that used it's special ability (a charge that will set it on fire and aggravate nearby dinos) it'll display a message saying "getting hot! Stay away!!!!" and that will set you on fire. Don't approach unless you know you're prepared.
Gigas can take these head on.. But when i say head on, i mean dont turn or divert from the path you've chosen. These guys are weak and will die within a few bites. if you try to turn, run away or if you have one behind you. U r as good as dead. One missile attack will kill you. your dinosaur won't die but good luck trying to get it back unless you got another tame. I highly recommend getting a skiff. But if your smart and not dumb enough to run in like a cow boy, you could take a mind wipe invest all into fortitude and movement speed. Get some parachutes and get to your tame. Good luck