Giant Spider (animal)
A catch-all term for an incredible variety of large arachnids found everywhere from tropical to polar latitudes, giant spiders tend to prefer environments that can accomodate their solitary, reclusive nature such as caverns, ruins and dense woodland. Though their diet mostly consists of small mammals and stray livestock, many of the larger species are fully capable of killing an adult human with their powerful venom.
If it weren't for the scattered bones lying on the ground and cocoons hanging off the ceiling, the gigantic spiderweb covering the mouth of the cave where our quarry resides in would be nigh-invisible apart from the most subtle of glimmers of reflected light. Despite being as thick as a rope, the web's strange optical properties make it appear as transparent as clear glass unless looked at from a highly specific angle.
The spider itself is nowehere to be seen, but it is most certainly in the vicinity - these monsters are not ones to roam, and subsist purely on whatever unlucky creatures wander into their lair. Of course, I have no intentions of actually searching for the arachnid myself. Disturbing the web is certainly going to attract the attention of the thing, and I begin to plan a course of action.