mb - nice cat (little bit oversaturated colors), great composition; as for Your second picture, You should do some PP as the sky looks very flat
monty11 - nice landscape, love the sun-rays breaking through the trees, very moody picture
gentoo - as for quality it's a very nice photo, but there's something wrong with the proportions as it looks that it's neither a 3/2 or 5/4, or any I know - I know that in birding the main purpose is to show the bird, but You could try to use the rule of thirds and i.e. with this photo position the bird in right corner with some space around, as very often on Your pictures we see only the main subject not the surroundings. Apart from this I really enjoy viewing Your pictures, as can learn a lot about birds from them.
Below my attempt to bird photography:

sorry for large size, but couldn't resist