I have seen that many times with osprey.I wish I had my camera back then.They dive into the water then a bout 30 seconds later come up with a little duck in their claws. That is how they eat and survive.It's not offensive, but a fantastic capture of Nature.I know this is probably why you got that lens, and am I ever wishing for one.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."