Pandas are very vocal, and will vocalize often, though the purpose is unknown. They are mostly active at twilight and nighttime. Sexual maturity is reached at 4 and a half to six and a half years old. The pandas only come together to mate. After mating, the male has nothing to do with the cubs, and leaves the female to raise the cubs by herself.
Females only breed once every two years.
Rather, they are spontaneous ovulators, meaning they can ovulate without any stimulation from the male. Implantation of the eggs in the uterus is delayed for a period of 45 - 120 days. After implantation, the gestation lasts from 87 - 163 days, depending on the time of implantation. The cubs are born devoid of hair, helpless and cannot see or hear. Though up to three cubs may be born in a litter, only one cub will survive to adulthood.