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“The genetic mixing work has implications for how today’s endangered animals should be protected, Dr. Barlow said. He wondered whether animals that have DNA from other species should be preferentially conserved because they are likely to be hardier, or whether biologists should preferentially protect ‘purer’ animals with less genetic mixing.”
https://www.nytimes.com/2018/08/27/science/cave-bears-dna-extinction.html

Extinct Cave Bear DNA Lives On in Brown BearsModern brown bears are carrying a bit of genetic material passed down from the cave bear, in a study that suggests extinction does not always vanquish a species’ genes.