What is one of the four basic characteristics used for animal identification?

Distinctive markings are a fundamental characteristic used for animal identification because these unique features can set individual animals apart from one another within the same species. These markings can include patterns, spots, stripes, and other identifiable traits that may vary among animals, even if they belong to the same species.

This method of identification is particularly useful in wildlife monitoring and research, as it allows for recognition of individual animals in studies related to behavior, population dynamics, and conservation efforts. Markings can also convey important biological information, such as the health or genetic diversity of a population.

While other characteristics like habitat preferences, feeding habits, and color patterns can contribute to an animal's identification or provide context about its behavior and ecological role, they are not as definitive or unique as distinctive markings when it comes to identifying individual animals. Markings offer a direct visual cue for identification, making them especially valuable in field observations or wildlife tracking.