What is in the water at the Smithsonian’s National Zoo’s Conservation & Research Center in Front Royal, Va.? Today the Zoo announced that another endangered clouded leopard cub – yes, that’s in addition to the two that were born there in March – was born on Friday.

Jao Chu, the 3-year-old clouded leopard who is already a mother to the two existing cubs, gave birth again at around 5:30 p.m. on Friday afternoon. Mother and cub are reportedly doing well (the father is also the same, 3-year-old Hannibal). No determination just yet on the gender of this latest cub (both of the other two are boys). The only thing we know is that this one is giving his or her older brothers a run for their money in the adorable department.

Given the clouded leopard’s endangered status, this rapid second birth is huge news. According to the National Zoo, the gestation period for clouded leopards is between 85 and 93 days, with 1 to 5 cubs produced per litter. Their web site says females can produce a litter “every year” – but, as it turns out, they might want to change that to more than once a year.