Nothing but darkness!

You point your trusty trout light into the blackess ahead, hoping to see some sort of telling sign of where to go. All you are rewarded with is unending blackness. Water drips somewhere off in the distance. You still can’t see either side of the tunnel and are beginning to get frustrated with this choice. However, as you were about to give up, you saw the walls coming back together ahead of you. The tunnel was narrowing!

This huge tunnel you just past through tapers to only about 8 feet wide. It abruptly splits in two at a large rock. You notice the rock has etched drawings all over it. There are drawings of cows heading toward the left tunnel, which seems insanely narrow. Birds and gila monsters seems to be etched in a direction toward the wider but much shorter tunnel - you’ll have to crawl. You may as well choose one now...

Take the really narrow path to the left?
or Get crawling to the right?