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During mating, the male rabbit will insert his penis into the female from behind, make rapid pelvic thrusts until ejaculation, and throw himself backward off the female. Copulation lasts only 20–40 seconds. [94] The rabbit gestation period is short and ranges from 27 to 30 days. [26]
In rabbits, the dewlap is a secondary sex characteristic of female rabbits which grows once the doe reaches sexual maturity. In laboratory conditions, when a butyl alcohol extract of the urine of pregnant women was administered to male rabbits, they developed a dewlap, which then gradually disappeared once the administration ceased.
This rabbit is medium-sized, measuring 36–48 cm (14–19 in) in total length, including a small tail that averages 5.3 cm (2.1 in). [14] [15] Weight can range from 1.8 to 4.4 lb (800 to 2,000 g), with an average of around 2.6 lb (1,200 g). The female tends to be heavier, although the sexes broadly overlap in size.
Hares are generally larger than rabbits, with longer ears, and have black markings on their fur. Hares, like all leporids, have jointed, or kinetic, skulls, unique among mammals. They have 48 chromosomes, [10] while rabbits have 44. [11] Hares have not been domesticated, while some rabbits are raised for food and kept as pets.
The literature available on the anatomy of Sylvilagus insonus mainly concentrates on the skull and therefore distinguishing features of the Omilteme cottontail's skull have been well described. The skull is large, approximately 78 mm (3.1 in) in length and 32 mm (1.3 in) in depth, with a large palate and a wide braincase.
An adult female averages three litters per year, which can occur in any season. Occurrence and litter size depend on several factors, including time of the year, weather, and location. The average litter size is four, but can range from as few as two to as many as eight, most of whom do not go on to survive to adulthood.
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The domestic rabbit (Oryctolagus cuniculus domesticus) is the domesticated form of the European rabbit, a member of the lagomorph order. A male rabbit is known as a buck, a female as a doe, and a young rabbit as a kit. There are hundreds of rabbit breeds, originating from all over the world.