Every once in a while, pretty rare, due to an interesting recombination of genes, somebody is born with a tail.

偶尔，由于有趣的基因重组，有人生来就有尾巴，这很罕见。

We sometimes call it an atavism, and that term is usually used for something that has missed a few generations or something that pops up due to an interesting recombination of genes.

我们有时称之为返祖现象，该术语通常用于指错过几代的东西或由于有趣的基因重组而弹出的东西。