I recommend reading the posts on this thread: -
What SLR for wildlife photography?
If you are a beginner to photography, the wrong choice might turn out to be a very expensive one.
In a nutshell, nothing will beat a DSLR (Digital Single Lens Reflex) system but to cater for generalised wildlife photography with DSLR, you will need several lenses - macro, wide angle, telephoto, along with numerous other accessories. The cost of such a system could well exceed £2000.00. (Even a basic DSLR system would be getting on towards £800.00 - £1000.00)
A bridge camera is a stand alone "all-in-one" unit. A good one will cost about £300.00 - £400.00. It will physically look like a DSLR, but has a fixed "super-zoom" lens, which will have a telephoto range of anything from 28-300mm to 24-600mm. Bridge cameras usually have 1:2 (half life size) macro, which means that you can take a photo of a 20mm lomg insect, and it will be 10mm long on the photo. (DSLR dedicated macro lenses are almost always capable of 1:1 lifesize macro.
As a beginner, I would stongly urge you to get hold of a copy of the book Digital Photography for Dummies (These are certainly not books for idiots, but are very good basic manuals for anyone wanting to quickly learn all the terminology, and general principles of digital photography).
Good luck with your choice.
Regards
Mike.