When you take your reptiles outside they Will nearly always go into a attack/defend mode because there is so much action outside they see/hear what we are conditioned to. while they are conditioned to the inside of our homes the lack of movement from small creatures and overhead enemys/objects is something they are usually not conditioned to unless they live outside. if they do live outside they often will act the same way because they see nearly anything they are not conditioned to as a predator and they must be aware of predators if they are to survive
"Far more crime and child abuse has been committed by zealots in the name of God, Jesus and Mohammed than has ever been committed in the name of Satan. Many people don't like that statement, but few can argue with it."