If you're looking for leeches (to get leech blood) just listen, cuz they make a sound in the water when you're close to them (it sounds similar to someone making but bubbles inside the water). Everytime I go to the swamp i always find them quick and easy due to this and I hope this help other people too.
These are not as rare as you think. Every other I get yoinked off a mount by a kapro I end up running into at least one. That being said I don't get yoinked off mounts often but when I do in the swamp I find a leech. After puttering around on my pelagornis I managed to find enough to get 30ish leech blood.
To the post that said they weren’t sure if swamp fever exists in mobile, it does. I’ve gotten it on mobile. Also I was killing animals in the swamp with my dire wolf and it said killed infected leech in the kill feed.
The yutyrannus, not the rex, is your best friend for leech hunting. The leech is vulnerable to the fear roar, and the debuff reveals their location. This makes hunting them a simple errand. You'll collect so much leech blood you could start a swamp fever clinic.
Hello gguys if a leech attach to your dinos you can remove it without using fire and if you look to the icon on the top left like the icon hand tap it and the leech is of you dinos mounts or flyer so if u find this a useful tip to take off the leech and is less dangerous