A successful adaptation is defined by an organism's ability to effectively adjust to its environment, enhancing its survival and reproductive success. Successful adaptations may manifest as morphological, physiological, or behavioral changes that improve the individual's fitness. For instance, animals may develop camouflage to avoid predators or evolve features like long necks for accessing food. The effectiveness of an adaptation is determined by its contribution to the organism's overall performance within its ecological niche, thereby influencing natural selection and the evolutionary trajectory of species.