Posted by Gigi Allianic, Communications An orangutan at Woodland Park Zoo, 14-year-old Batu, is expected to give birth soon and is nearing the end of her pregnancy, which for orangutans is nearly nine months. The birth will mark the first orangutan born at the zoo in 35 years. Birth window calculations are based on estrus cycle, physical changes including weight gain, timing of mating and positive pregnancy test results. As a result, it is not possible to accurately predict a specific birth date, but recent changes indicate it is approaching. A pregnant Batu, photo by Laura McComesky/Woodland Park Zoo The birth management plan tailored for orangutans at the zoo includes a pre- and post-natal care program which includes regular veterinary check-ups in consultation with an obstetrician gynecologist, ultrasound procedures to track fetal development, a diet created by a nutritionist, and supplemental vitamins to help Batu maintain a healthy weight for a delivery without challenges. Just