36 birds and 11 storks were sitting on the fence. 42 more storks came to join them. How many birds and storks are sitting on the fence?
There are 36 birds and 11 storks sitting on the fence. 

42 more storks came to join them. 

That means there are now 42 + 11 = 53 storks sitting on the fence. 

As for the number of birds, we don't know, because the question doesn't give us that information.