Litters from multiple sires tend to be more genetically diverse than litters of single sires. The first litter is usually smaller than subsequent litters. It issues Pedigrees for purebreds and litters. Additionally, small dogs from Sussex Spaniel litters were called Cockers. Clumping clay cat litters are natural products. Spaying and neutering prevent unwanted litters, overpopulation, and inbreeding. Hamsters are capable of producing litters every month. It is largely nocturnal and solitary, except when breeding or raising litters. Females are capable of having three litters per year. Females can have five to ten litters per year. In some areas, sand cats give birth to two litters per year. May. Litters comprised two to three cubs. A few accounts exist that describe females defending their newborn litters. Most biodegradable litters last longer than the equivalent size of clay or clumping clay litters. Some litters were produced using artificial insemination.