Credit: Kansas City Zoo/Cover ImagesA US zoo hosted a gender reveal party for its eastern black rhinoceros calf. The Kansas City Zoo revealed the gender of its newest baby rhino when the newborn’s father, Ruka, speared a stuffed ball that revealed pink confetti. The eastern black rhinoceros is a critically endangered species, making the birth of the new calf all the more important. The female calf was born on Dec. 31, but the zookeepers have kept the baby girl and her mother, Zuri, out of the public eye in order to give them time to bond. There are roughly 740 eastern black rhinos left in the wild and only 53 in facilities accredited by the Association of Zoos & Aquariums, according to the International Union for Conservation of Nature.