DNA breaks down as soon as cells die, so no fossil has perfectly-preserved genetic material, which means we will probably never know the complete genome of any extinct species. But if a fossil is young (tens of thousands or hundreds of thousands of years - before most of the DNA has degraded) and preserved in good conditions (cold and dry are best for DNA), you can find some - and sometimes lots - of preserved DNA. We’ve found genetic material for animals such as mammoths, sabertoothed cats, birds, and many more.
https://www.quora.com/Can-you-get-DNA-from-fossils
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