As a biology undergrad (not wildlife management), and like the poster above said, I found out the hard way competition for biological jobs is tough (and low-paying).

I got a masters in environmental engineering, and while the pay is a little better, there seems to be much more opportunites out there. It's not exactly what you said you wanted to do (but then again... I was a freshman pre-med student... for about 1 semester), but it is socially rewarding. for example, I'm working on the design for remediation on the largest superfund site in the US, have seen figures I made on TV, and get to see first hand the cleanup of smaller rivers/streams.

If this interests you, check into universities that have environmental engineering specific majors (look in the civil engineering departments). There is a difference between environmental science and environmental engineering.