Hi Matt and welcome to the forums.
It can be hard choosing your first DSLR, particularly as there is so little to choose between any of the entry level models, in terms of quality, offered by the likes of Canon, Nikon, Sony, Olympus, Panasonic and Pentax. Each one is capable of capturing great images once you know how to use it. So which one should you go for?
Canon and Nikon offer the most extensive range of lenses and accessories for you to choose from as you build up your photography system. Sony have lead the way in terms of trying to give you more features for your money, possibly at the slight expense of cheaper build quality. Both Olympus and Panasonic have focused more on tackling the bulkiness and weight issues, that beset many DSLRs and have compiled a range of lighter and more compact DSLRs that again are fully featured with superb quality lenses. Pentax have continued to produce fine quality cameras, though their lens motors can be a bit noisy and slower than their rivals.
So where do you start, when looking to buy a new DSLR. Well you can read the reviews on each model, canvas opinion of other photographers, but none of them will be able to answer the one vital question. That is, which is the camera that is going to best suit your needs, because this is very much a personal decision. My advice would be to try a few out, have a bit of play with a few of them. See which ones you like the feel of and which ones you find easiest to use because the controls are intuative and are ergonomically placed. Have a look through the menu systems, again to see which you find the simplest to use, because the more you can focus on the image you want to produce and not get confused wondering how you set the camera up to capture it, the better!
Now if you're looking for a camera to take wildlife pictures, as Ana has mentioned you will need a telephoto lens to get you close to your subject. It might, therefore, be worth looking for a bundle deal that includes a telephoto lens with the normal kit lens as it could save you a lot of money and get you started. Decent telephoto lenses are very expensive and very heavy so you might as well practice with the starter telephoto lens and start saving up for the lens you really want to buy at a later date, because you can pay upwards of £500 for one of these, some cost several thousands of pounds.
So in summary, there is nothing to really separate any of the current range of entry level DSLRs except their different menus and where they have place the controls. Their build qualities may also vary a little, but not to the extent that this should be a major factor. So set yourself a budget, have a look round to see what deals are available for a twin lens kit and be sure to trial the final three camera on the shotlist you draw up. If you're still unsure and have a few more questions, just post them on here and one of us will give you a prompt answer.
Best of luck with your quest!