Fleet of foot
The desert monitors in particular are a class vanishing act. They can literally disappear before your eyes—that's if you manage to get close enough to spot them in the first place. (Here, tracks leading to a perentie.) Monitors can sense you from hundreds of feet away and usually dive for cover before you know it. Or they simply "freeze" and blend in with surrounding logs and rocks. The camouflage of their beautiful skin patterns can make them invisible even from close range.