Rabbits are small mammals in the family Leporidae of the order Lagomorpha, found in many parts of the world. Rabbits are classified into seven species, typically the European hare (Oryctolagus cuniculus), cottontail rabbit (genus Sylvilagus; 13 species), Amami rabbit (Pentalagus furnessi, a rare species of rabbit from Amami Oshima, Japan). There are many other rabbit species in the world; cottontails, bobcats, and hares are placed in the order Lagomorpha.

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The domestic rabbits raised today in the world are largely descended from the crossbreeding of European and African hares from the Middle Ages. After a long domestication process, there are over 80 rabbit breeds in the world. In the United States, the Rabbit Breeding Association (ARBA) is a valuable source of commercial pets and breeds. ARBA has confirmed 47 different breeds of domestic rabbits, Trianta and Mini Satin being the two closest to being recognized in 2006. In the UK, the British Rabbit Council also provides valuable information. The famous rabbit breeds are the American rabbit.

Domestic rabbits are sensitive animals to external factors, quite adaptable to the environment at 31 – 48°C, with an average of 39.5°C. Rabbits have few sweat glands under the skin, and the body loses heat mainly through the respiratory tract. If the air temperature rises rapidly and the heat persists above 35°C, the rabbit breathes rapidly and is hot to expel heat, then the rabbit is susceptible to heat.

The rabbit breathes very gently, there is no sound, only the abdominal wall vibrates with the rhythm of the fiber. If the rabbit is healthy, in a normal environment, the respiratory rate is 60-90 times/minute.

The heart rate of rabbits is very fast and weak, averaging 100-120 times/minute.

Body temperature, respiratory rate, and heart rate are all positively related to the ambient air temperature, in our country the most suitable ambient temperature for rabbits is from 20 to 28.5°C.

The sense of smell of rabbits is very developed, the mother rabbit can distinguish between new arrivals within an hour by smelling. The structure of the nasal cavity is very complicated, with many fine septums and nooks and crannies. Inhaled dirt will accumulate in the septum, causing inflammation of the sinuses.

Rabbits are very hearing and sharp: in the dark, rabbits can still detect small noises around and can still see and eat normally.