chamelons do not literally "protect" themselves from enemies, as most species have no means of defense. chameleons just change color to blend in with their surroundings.
They squirt thick, black ink at the enemy and propel themselves away. They also use there camouflage abilities to almost perfectly blend into the surroundings.
As an apex predator, a falcon does not have much in the way of enemies other than other predators. The simplest answer is probably - it protects itself by killing its enemies. On a broader basis, it...