Yes. The problem with Wesleyan is that there are almost too many centers of gravity on any given subject. The Dept of Earth Science & Environmental Science is indeed the successor to the old Geology Dept of 50 years ago and still leans a bit heavily in that direction. However, as @Shelby_Balik points out upstream, there is another, entirely new division of the university devoted to environmentalism that allows the subject to be pursued through the filter of a primary or linked major that can be almost anything.
So, while it may not be a complete answer to your child’s stated interest in land-based animals, the course catalogue for Wesleyan’s College of the Environment looks pretty robust for an LAC:
WesMaps - Wesleyan University