Wee Wee Wah Wah

So Linc and I were just looking at the pics from the zoo. He was saying bye-bye monkey and then said wee wee wah wah...as in oo oo ah ah. He has never imitated an animal sound before! It was unexpected. I mean I make animal noises when we are looking at pictures of them but he's never repeated them back. Then today, out of the blue he does. He's always been like that. He'll do it when he's ready.