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Confidence votes 8.9K. A Black Rhino is pregnant usually between 419 and 478 days, or 15 to 16 months. The mother will give birth to a single calf, weighing in on average 35 to 50 kg, (about 80 pounds). The calf will stay with it's mother anywhere from 2 to 3 years, and sometimes, if the calf is female they may stay longer, and form a family type group of females. For more details, see the sites listed below.
1 Gestation is unknown but is presumed to be approximately 15-16 months, as in other rhinos. 2  Inter-birth intervals are unknown, but mothers probably give birth to one calf approximately every 2-3 years. 3  Javan rhinos are solitary in nature and are rarely seen.he Javan Rhino is the rarest of the rhino species with 58 â 61 animals surviving only in Indonesia. The last Javan rhino living in Vietnam was poached in 2010.