I've been at the Fort for about four and half years, graduating here at the end of the month. I've had great experience thus far, though the school is going through some pretty tough financial times...I can't really answer your question about the Biology and the Environmental Studies department... Considering the kind of funding the Fort gets from the state, my guess is that research opportunities are fairly limited. Faculty wise, the Fort is hit and miss. I've had some really great professor, I've had some really shity professor.
Life outside of the college is really where it's at...the community of Durango is awesome. Location is about as good as you gonna get outdoors wise...2 hour drive to Moab or Telluride, Weminachue is you backyard, not mention the Upper A, the Peidra, and Vallicito. The nightlife doesn't have a whole lot offer but El Rancho is pretty priceless watering hole. Ultimately, if your more academically oriented the Fort probably is not for you... hope that helps to answer some of your question...