Gajalaka tailraider all day every day.
One of my favourite parts of the game is how much effort and detail has gone into the monsters and various animals when you're not fighting them. Sometimes I like to follow the various monsters around just to see what they do. Sometimes anjanath will wander over to a cliff above the shoreline, squat down, and just gaze out to sea for a while before heading back for a nap. Kulu-ya-ku will walk over to a nest, have a look around, pick up and egg, then quickly run off and hide to go and eat it, then maybe go for a drink of water. If it preens itself along the way, it'll leave a few feathers to inspect. Great Jagras will go chase down an aptonoth, eat it, head back to the little pond where the other jagras hand around, then vomit up a chunk of meat for them, which they'll happily run over to eat (one of the few times they'll ignore you). The aptonoths themselves will sometimes arrange themselves into a defensive formation when threatened (not just in the scripted cutscene), and will lie down to rest if it's night time on the map. Thankfully they don't stop to talk to each other about mudcrabs. It makes it feel like it's an actual ecosystem you're entering, and you're not just in some run-down monster Westworld like Ark where they just mill about aimlessly 24/7 and are utterly braindead in their behaviour. When I am fighting them on the other hand, the game also frequently makes me feel bad about bashing their skulls in when they're close to death, and they start panting and whining and limping, or screwing up their attacks. It's the fucking Sif fight all over again.