Science. 1970 Jun 12;168(3937):1364-6 doi:10.1126/science.168.3937.1364

Wurster DH, Benirschke K

Indian muntjac, Muntiacus muntjak: a deer with a low diploid chromosome number.

Males have 7 chromosomes and females have 6. The X chromosome is linked to an autosome by a thin neck, while the Y chromosome is free.