Do you want to see something interesting? Check out the Indian Muntjac:

The X fragment is always fused to the autosome, while the Y chromosome stays unfused. So 2n is 6 in females and 7 in males.

Their close relative the Chinese muntjac has 2n=46

And they can interbreed with sterile offspring.

Like an n=3 gamete can fuse with an n=23 gametes and it ‚works‘

They both come from n=70 ancestral deer.

The Indian one just went let’s fuse all the chromosomes.

https://www.jstage.jst.go.jp/article/cytologia/70/1/70_1_71/_pdf