Where is the most common place to put a tag which identifies an animal?

The most common place to tag an animal for identification is the auricle, which is the outer part of the ear. Tagging in this area is advantageous because it is relatively easy to access, allowing for quick identification of the animal without causing significant stress. The ear is also a location that is less likely to interfere with the animal's everyday activities, as compared to other body parts.

Tagging in the auricle is a widely accepted practice in livestock management, as it provides a clear and visible means of communication for farmers and ranchers to identify animals. Tags can often be seen from a distance and can include important information such as the animal's ID number, breed, and health status.

In contrast, the other options are less practical for tagging. Nares, or nostrils, would be difficult for visibility and could interfere with breathing. Tagging the skin might not provide a permanent or visible identifier and could result in more discomfort for the animal. Vibrissae, which are specialized sensory hairs, are not suitable for tagging due to their location and function, as they are designed to sense environmental changes and not to hold tags.