A close friend of mine chose Wildlife Biology as his career path, and my understanding is that the jobs are very competitive, often seasonal, and often for quite low pay. However, he has generally loved most of the seasonal jobs he's taken. He's done work in Texas, West Virginia, Michigan, Pennsylvania, and Arizona in the 10 years since graduating from college, but has had to rely on the retail & customer service sector between seasons and still has struggled to land a permanent full time position somewhere.
If you're in college, or will be going soon, I would recommend finding as many ways as possible to diversify your education and experience. Join as many clubs and organizations as possible. If possible, minor or dual major in Geographic Information Systems (GIS); GIS is an important tool to lots of Wildlife Biology research and work. Not only would that give you a backup plan for a career in GIS if opportunities in Wildlife Biology are tough to find, but it would also add a valuable commodity to your resume when being considered for jobs in that field.