Female elephants have the longest gestation period of all mammals (lasts for up to 23 months) with only one percent (1%) of elephants births resulting into twins. Calves weigh approximately 120 kgs at birth. Twins tend to be lighter but would nevertheless need a great deal of milk from their mother and the mortality rate for twins is high, as they compete for food from one source. This set of twins, two boys, are the sons of Pazia of the PA1 family. She is from one of the families that spends most of their time outside the Park. The Pazia Twins reached their first birthday in April 2021.