Giraffe up. The calf emerges head and front legs first, having broken through the fetal membranes, and falls to the ground, severing the umbilical cord. The mother then grooms the newborn and helps it stand up. A newborn giraffe is tall. Within a few hours of birth, the calf can run around and is almost indistinguishable from a one-week-old. However, for the first 1–3 weeks, it spends most of its time hiding; its coat pattern providing camouflage. The ossicones, which have lain flat while it was in the womb, become erect within a few days. Mothers with calves will gather in
Reticulated giraffe Rothschild's giraffe or reticulated giraffe herds. The San Diego Zoo Safari Park, Bronx Zoo, and Chester Zoo have herds of just Rothschild's giraffe. Cheyenne Mountain Zoo, Busch Gardens Tampa, The Maryland Zoo, and Omaha's Henry Doorly Zoo all have strictly reticulated giraffe herds. However, some zoos still breed Rothschild's giraffe and reticulated giraffes. At Utah's Hogle Zoo, their giraffe herd consists of male Riley, a reticulated giraffe, and females Kipenzi, a reticulated giraffe, and Pogo, a Rothschild's giraffe. In early 2016, Willow was born to Riley and Pogo. According to the new research discovered in 2016, Willow would be a