In geography class in college, the teacher talked about identifying old house locations sites in the Caribbean. I've forgotten the details over the last 30-odd years, but what they did was look for a place with multiple tree species with edible fruit. The idea was that if you found a small area containing, say, an orange tree, an avocado tree, a mango tree, a guava tree, and a lime tree there was probably someone living there.

(I picked those tree since they were the trees closest to my childhood house in Miami, not because I remember what the teacher said.)