Head to herbivore island off the south east shore. Try to bring a pulmenoscorpius or beelzebufo for topor attacks. Knocking it out wont be too hard on those mounts but if you don’t have one hop on the cliff above everything and fire away a bow crossbow compound bow or gun. Berries aren’t too hard to find just remember to keep narcotics on you just in case. In the time it takes to tame it you could start making a second base on herbivore island because it has metal infused rocks.