Coloration took the information that I have found that probably lived shallow lagoons and river basin where the water was shallow and turbid hence the camouflage color. When it comes to skin invoice information not found or was smooth and slightly porous, probably not actively hunted and attacked out of hiding, so he might not need smooth slippery skin.

http://www.eavp2015.uni.opole.pl/shownews.php?cat=1&lang=pl&amp

;m=1