<p>Economics & math will give you a wider array of job opportunities related to those fields, that is for sure. If you were really passionate about wildlife bio, I wouldn’t recommend against it, but since it doesn’t seem to be the case, the “safer” route is the other one. You’d probably get a better chance at getting involved in a wildlife biology job through a (econ &) mathematics major with a biology minor, as biologists are a dime a dozen, but job applicants with applied quantitative skills (data modeling and analysis) are harder to find.</p>