Savannah Cat

Most F1 generation Savannahs will possess many or all of these traits, while their presence often diminishes in later generations. Being a newly developing, hybridized-breed of cats, appearance can vary far more than cat owners may be used to.
Reproduction and genetics
As Savannahs are produced by crossbreeding Servals and domestic cats, each generation of Savannahs is marked with a filial number. For example, the cats produced directly from a Serval/domestic Cat cross are the F1 generation, and they are 50% serval. F1 generation Savannahs are very difficult to produce, due to the significant difference in gestation periods between the Serval and a domestic cat (75 days for a Serval and 65 days for a domestic cat), and sex chromosomes. Pregnancies are often absorbed or aborted, or kittens are born prematurely. Also, Servals can be very picky in choosing mates, and often will not mate with a domestic cat.