Here is how i caught one alive. It happened after "The End" battle. I
use my Sonar to ping all the animals location and kills all the animals
in that area map. But soon you will realize that there is a blip in your
sonar, but when you try to move on the location, you wouldn't see any
life form(I suspected it was kinda invicible), but your sonar tells you
that there is something hidden there.
I then walked to the sonar contact location(stand on the same spot as
that dot) and put some mouse traps on the same spot(the time i did, I
put 6 mouse traps around it).
Then, I backtracked to Sokrevenno South then re-enter
Sokrevenno North, then I heard my mouse traps had make a sounds.
Moving to the location and found out that one of my mouse traps had
successfully captured one Alive !
Upon opening "Survival View", I can see that "Tsuchinoko" seems to be
eatable and gave you great healing on stamina."
So, it is a small snake, that is undetectable by radar, thermal goggles and
anything of the sort. Your only way to capture it so far is to set mousetraps.
If you keep it until the end of the game ALIVE, you will unlock the Infinity
Face Paint *cue angelic singing*. And don't worry if Eva lets it go at the
waterfall. Just go back and pick it up. It is found in the Fear's area and
there are reports of it in the End's area. Some people report it in Dremuchij
South.