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.
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...
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.
What makes polymer on Aberration, Valguero, and Fjordur a walk in the park. There are other maps but I have yet to go there (as I decided to do all notes and bosses run). I have harvest setting set to 3.0 so some dinos yield more from the body of a karkinos than others. Moschops can harvest more with the secondary attack with bonuses based on organic polymer bonus by percentage in levels if that makes sense. Regardless of dino you will come home with probably a lot of organic polymer.
The Karkinos is considered a large predator and therefore does not aggro other predators when ridden (with the exception of other karkinos, rock drakes, etc.), making it a great mount for relatively safe traveling!
HOWEVER!!! Smaller predators WILL attack if your karkinos is holding a prey creature in its claws, so keep this in mind while transporting tames and wild creatures!