We analyzed the hair microstructure of Korean small terrestrial mammals, such as Rodentia and Lagomorpha, to classify the characteristics of hair morphology. Micromys minutus showed a unicellular irregular type of medulla structures; on the other hand, the other mammals showed multicellular structures. Regarding the cuticular scale structures, the Rodentia species exhibited a narrow and broad diamond petal type, while the Lagomorpha species exhibited an elongated petal type. Interestingly, the hair cross-sections showed quite unique characteristics. We constructed hair identification keys to distinguish species with a single hair. The dichotomous key of Rodentia and Lagomorpha can be used for their behavioral ecology and dietary analysis of upper predators to serve as the basis for ecological research.

Abstract
INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
ACKNOWLEDGEMENTS
REFERENCES

• Yung Kun Kim(Mammal Research Team, Research Center for Endangered Species, National Institute of Ecology, Yeongyang 36531, Republic of Korea)
• Junghwa An(Division of Animal Resources, National Institute of Biological Resources, Incheon 22689, Republic of Korea)
• Eunok Lee(Department of Research Planning, National Institute of Ecology, Seocheon 33657, Republic of Korea) Corresponding author