Along with the various rattlesnakes, black widows, brown recluse's and other kreepy crawlers that humans get in trouble with...lets think about our four legged geodogs and pets that come along. I see that some have mentioned cacti and bushes. Here in South Dakota there are miles of barbed wire fences, some up...some down...some in balls...some pieces just lying there. I just spent a eavning in the doogie ER because of that. Then there are the porcupines, badgers, and oh yeah mountain lions! These lions already have grabbed a couple of pets from homes in the area. Don't mean to scare anybody from caching here but just please be careful!