I think the banner could be a little more engaging. A simple gradient doesn't really convey what the site is about. Maybe try to incorperate picture of one of your animals into it?

I agree on the font change. A simple sans serif font might do the trick.
I would also add an "about" or "contact" page. You could also add a little blurb on the front page that explains what the site is about and what all the navigation links mean. I think the site has a general good layout, but it could use some work on the aesthetics and content.