1 Total body length more than 250 mm...................................................................... 2
- Total body length less than 250 mm....................................................................... 4
2 Ears do not exceed 20 mm in length............................................................ Nesokia indica
- Ears exceed 20 mm in length............................................................................ 3
3 Tail longer than body length.................................................................... Rattus rattus
- Tail shorter than body length............................................................... Rattus norvegicus
4 Palm with 5 rounded tubercules.......................................................................... 5
- Palm with 3 rounded tubercules............................................................... Mus musculus
5 Orange fulvous to yellowish brown spot on the neck.......................................... Apodemus flavicollis
- No orange fulvous to yellowish brown spot on the neck...................................... Apodemus mystacinus