Our animals are pedigreed and many can be traced back to the wild-caught founders. The animals are assigned individual identification numbers. The last two digits of the individual's number is ear marked.
Weanling deer mice are identified by ear punch. Only the last two digits of an animal number is marked. (ear marking chart - pdf)
We prefer the scissor style ear punch that can be purchased from Roboz. (Roboz Punches - pdf)