In biology, a negative taxis is a directional movement where an organism moves away from a specific stimulus. A classic example is negative phototaxis shown by cockroaches, silverfish, or earthworms, which instinctively scurry away from light sources to find safety in the dark. Another common example is negative geotaxis (or negative gravitaxis) seen in fruit flies or certain larvae; when placed in a container, they will naturally crawl upward, moving against the pull of gravity. Additionally, many microorganisms exhibit negative chemotaxis, where they swim away from high concentrations of harmful chemicals, acids, or salt solutions to ensure their survival. Unlike "kinesis," which is random and non-directional movement, negative taxis is a deliberate, straight-line flight or movement away from the perceived threat or unfavorable environment, helping the organism maintain its homeostatic balance.