Opossums have a fairly discernable “thumb” print, and a bear’s hind paw print looks similar to a wider and shorter human footprint. What are the invasive species threatening NY ecosystems?

1. Von Duyke AL, Crawford JA, Quakenbush L, Adams JR, and Waits LP (2023) Determination of polar bear (Ursus maritimus) individual genotype and sex based on DNA extracted from paw-prints in snow.

The day began with snow in Brandenburg ... Opossums have a fairly discernable “thumb” print, and a bear’s hind paw print looks similar to a wider and shorter human footprint.