PCR/amplification is black magic. I'm also amazed by "no the DNA will be too old" keeps turning out not to be entirely true: People getting out of jail from re-testing evidence 20+ years later, Hominid DNA statements being made from archaic bones..
Animal population studies used to be (in my understanding) largely observational. Now, people can do scat tests and identify individuals.
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PCR/amplification is black magic. I'm also amazed by "no the DNA will be too old" keeps turning out not to be entirely true: People getting out of jail from re-testing evidence 20+ years later, Hominid DNA statements being made from archaic bones..
Animal population studies used to be (in my understanding) largely observational. Now, people can do scat tests and identify individuals.