But long-term studies have shown that wild panda populations can have reproductive rates comparable to some American black bear populations, which are thriving.
- Giant pandas reach sexual maturity at 5.5 to 6.5 years.
- A female can mate with several males, who compete over her.
- A male will seek out different females who are on heat.
- The mating season is in spring between March and May.
- Males and females usually associate for no more than 2-4 days.
- Gestation takes from 95-160 days.
- Pandas normally give birth to single young
- Twins seem to be born more frequently in captivity, when artificial insemination is used.
- The reproductive rate is about 1 cub every 2 years.
- A newborn panda cub weighs just 90-130 g.
- A cub is just 1/900th the size of its mother - one of the smallest newborn mammals relative to its mother's size.
- Pandas are dependent on their mothers for the first few months of their lives and are fully weaned at 8 to 9 months.
- Most pandas leave their mothers when she becomes pregnant again, usually at about 18 months.
- A panda's average life span in the wild is 14-20 years.
- But they can live up to 30 years in captivity.
- Giant pandas are generally solitary.
- Each adult has a well-defined home range.
- Although they are not territorial, females do not tolerate other females and sub-adults within the core areas of their range.
- Encounters are rare outside the brief mating season, but pandas communicate with each other fairly often, mostly through vocalization and scent marking.
- While roaming their territories, they mark their routes by spraying urine, clawing tree trunks, and rubbing against objects.