The 23 million-year-old creature was not a direct ancestor of today's seals, sea lions and walruses, a group known collectively as pinnipeds.
这只2300万年并不是如今豹、狮和象直系,是来自另一个分支。
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Researchers had already discovered the capacity for vocal learning in species other than humans, including in songbirds, hummingbirds, parrots, cetaceans such as dolphins and whales, pinnipeds such as seals, elephants and bats.
研究人员已经发现人类以外的物种具有发声学习的能力,包括鸣禽、蜂鸟、鹦鹉、海豚和鱼等目动物、海豹等鳍足类动物、大象和蝙蝠。