It is a dark brown and light yellow Cal king.

Could be from black and white stock mixed with brown and yellow stock. Could be from black and white stock that sometimes throws some yellowish bands. Those are guesses, and that is all you have to go by.

When you breed a black and white Cal king with a brown and yellow Cal king, the babies can hatch very black and white looking, but yellow up a few months down the road.

Most black and white Cal kings brown up a bit with age due to thickening skin among other things. White can become a tad yellowish too at the belly. Lots of slight variation even in a locality.