To be honest don't even go to the swamps anymore. First the leeches know this. I would have a compound bow out at all times. Compound bow because it has the fastest melee speed of all ranged and melee weapons. Also be careful about being on a flyer cause kaprosuchuses can knock you of your mount. So, weapon: compound bow. Mount: Tapejara.
Try not to let it get close because it can jump quickly and far. Try to run uphill so that when they leap they won’t travel very far. Also their bite drains your stamina so try to avoid them at all costs.
This guy is my favourite so far, right from when I first meet him, I was a noob and wandered close to a swamp well he came flying at me missed and disappeared behind me, I'm like what the neck was that, climbed a big arse rock asap and looked around, bugger came bounding back towards me and leapt straight up that rock like it was a mole hill.
Tamed the bugger and took him hunting, came across my first raptor and shat myself thinking oh rap I am screwed, nope Kappa flys over my head, collects the raptor and pile drives it into the ground several meters away, hilarious. Always fun times with Kappa around.