A three-month-old Crowned lemur (Eulemur coronatus) sits next to its mother in their enclosure at the zoo in Mulhouse, northeastern France. Every year there are about 250 to 350 births at the Mulhouse zoo. Some young animals, once weaned, can be introduced in protected zones of their original region. If not, they go to other zoos to make up other families. Genetic mixing is necessary for the animals' health and the survival of the species.