I don’t know if this was just a glitch or if anyone has experienced this, but when I took mine down to the ocean floor, the only creatures to actually aggro to me was the Europtryd. Plesiosaurs, electric eels, the giant squids, even an alpha Mosa didn’t try to attack me. Super slow, but this might be the best tame for trekking the ocean floor.
Alright not exactly my tip, but heard this from the YouTuber pterafier. He said that using a Crab with a Turtle with C4 strapped on it is a good seige device. Put C4 on Turtle, then use Crab to throw the Turtle at a base. Detonate the C4, blowing up the base where the Turtle is at. I'd recommend watching Pterafier, he has a lot of tips on his channel.
If you're carrying a tamed Doedicurus in your claw the Doedic will automatically start harvesting any stones you hover him over. Just start pumping points into your Doedic's weight because it will stop at about half of its own carry weight. I've yet to discover another tame it will work with though...
Be careful when carrying a Dino that has a tribe mate mounted on it. I was walking up a hill carrying my anky with a tribe mate on it and they went under the map and died. RIP ANKY AND SHINEHORN. Tribemate was eh anyway.