Much better. Still need some work on that composition, but you've got the idea. Try sitting, or even better (if you can) laying down to get shots of birds on the water or walking on land. You'll find that being at their level makes them appear taller, bigger and can make the viewer feel at an equal or even inferior position relative to the animal, making for much more dramatic shots.
For example, the shot you have of the duck surging through the water; imagine if that was taken from water level (or at least close to it) and how the bow wave at the front of the bird would look then - the look of the bird coming directly towards the viewer would've made for some great action.
Here's a couple of mine: The first one of the seagull, was when I first picked up a camera (Finepix S6500fd for those interested). A boring shot of a sea gull from standing height. It's also in the middle of the frame and is slightly under-exposed:
This one, taken last summer, is much more dramatic. The bird is doing something - stretching it's wings and I'm at the bird's height. Making it appear taller and much more interesting. It also fills the frame and follows the Rule of Thirds:
Just some ideas. Next time you go to the park, put your scruffy trousers and shirt on and get on the floor!