Calculus has a striking pattern to his thick, short hair coat. His father was a Russian blue and mother a mixed calico/tabby. He is a heavier and more muscled guy than his brother, Growler. (see other listing) He was born under the boys' bed and has been in the care of the kids ever since. He has always been kept indoors (save the songbirds) and is a good mouser. Our living situation has changed and it will be better for them to have a new home. Available together or separately.