Dr. Mrinalini Watsa, a researcher at San Diego Zoo in California, scoops up soil from a fresh paw print made by Rakan, a 4-year-old male Sumatran tiger who lives at the zoo, and secures it in a specimen jar.
source https://www.cnn.com/2022/12/04/world/sumatran-tiger-paw-prints-dna-scn/index.html