Not sure if it's a glitch, or something else, but it can get the same invisibility buff as arthropods ;

I went to lava cave, with my spider, then, tamed the spitter within the cave, and when I reached out, it even agro on a rex, but the rex didn't even reacted

Tried again on other Dino's, no reaction as well

Didn't tried to breed it yet, to check if it would keep this hability, but if so, it would be awesome

Works on mobile, and would try to bring other creatures from outside to inside, to check if it would get this bug as well, it would be freaking awesome (imagine, you'd get a whole army of Dino's, completely invisible to wild creatures...😅😅😅😅)