What an awesome shot! Was Mama Bird out getting the groceries, that you were able to get so close? Or, as Mum42 asked, did you use a powerful zoom? Either way, congratulations on your marvelous photo! :)
Unfortunally I have a Pentax 330RS and so i cannot use additional lens or zoom,in this shot i have the fortune to find those birds really near to the big and beautifull waterfall