 On July 11 , 1993 , Pattycake and Timmy gave birth to <unk> , a male gorilla . The pair also gave birth to twin males , <unk> and <unk> , on August 8 , 1994 . It was the sixth time western lowland gorillas had given birth to twins in captivity . The twins were raised in a separate habitat by surrogate mothers . After seven years , <unk> and <unk> , along with another gorilla named Dan , left for a zoo in Nebraska in February 2001 . On February 4 , 2001 , Pattycake and <unk> gave birth to <unk> , a female . Her last and tenth baby gorilla , a male , was delivered on April 15 , 2002 . <unk> , it died four days later . 
