The backbone does not deviate from its normal course to support these structures which are merely masses of fleshy tissues, large and full when the animal is healthy and well fed. The fat stored in the humps may be drawn upon in times of need. When this occurs, the humps may decrease greatly in size or, especially in aged animals, fall to one side. Apart from the two humps, the main characteristic of the bactrian camel is its long, shaggy hair which keeps it warm in winter months, but is shed in summer, leaving the body almost naked. Docile and slow moving, their lolling gait enables them to raise both legs on one side at the same time.
Males are sexually active throughout the rutting season, when their testes increase greatly in size.
Males become sexually mature when at 4 to 5 years old, and females at 3 to 4 years. Some females will breed at 6 months to 2 years, but it is not recommended. Females may continue, with good health, to produce young until approximately 30 years of age. During rutting season, a female camel is receptive for 3 to 4 days or more, followed by 10 to 20 days of anestrus. If she doesn't conceive during one period of heat, the cycle is repeated.