The vast majority of woolly mammoths went extinct at the end of the last ice age, but small, isolated populations managed to hold out for a little while longer. New research uncovers the extent to which at least one of these final mammoths suffered due to its many mutations.
https://gizmodo.com/one-of-the-last-mammoths-on-earth-was-so-inbred-it-los-1841518765