Trouser Snake by TranzmuteProductions on DeviantArt
This creature is called "the trouser snake". They were first found in Brazil after the Medeira River was drained, their outside skin makes it look like they are giant grey penises :
UnNews:Man killed by Trouser Snake - Uncyclopedia
Not Trouser Snake by vincentwolfe -- Fur Affinity [dot] net
Funny Trouser Snake Cartoon Design" Magnet for Sale by ArtformDesigns | Redbubble