The reason a fly swatter is an efficient tool for killing flies while the human hand is not is as follows: a fly’s tactile sense is controlled by numerous sensory hairs covering its entire body. These hairs are especially sensitive to air pressure. The movement of a hand or any other solid object creates fluctuations of air and warns the fly well in advance of the blow. The fly swatter, however, has many holes arranged along its surface, so that it displaces little air as it bears down on its victim. Thus the fly is caught unaware.

Lions communicate through a range of behaviours and their expressive movements are very highly developed. They will perform peaceful tactile actions such as licking each other and rubbing heads. Head rubbing, or nuzzling, is a common greeting behaviour for lions. They also communicate through a variety of vocalisations including purrs, snarls, miaws and hissing. Their vocalisations also vary in intensity and pitch.