Final answer:
Small animals are identified using methods like tattooing, which is similar to human practices like scarification. Tattooing in the animal world is a part of identification and research. DNA-based identifications also play a crucial role in early detection of non-native species.
Step-by-step explanation:
Identification for small animals includes methods such as tattooing. This process involves making a permanent mark on an animal's skin for identification and can be related to similar practices in humans such as scarification. Animals that are commonly identified using various methods include insects, amphibians, reptiles, and birds; along with mammals like mice, squirrels, and larger ones such as deer and bears.
Tattooing in animals may serve for research tracking, ownership identification, or to signal that an animal has been neutered or spayed. Small animals with bivalve shells, however, may not be suitable for tattooing due to their physical characteristics.
Additionally, for certain applications such as the early detection of non-native species, DNA-based identification techniques can provide accurate and early identification which is crucial for managing potential ecological impacts.