在人类的认识中，很少有动物的幼仔能够发出叫声。
Few larvae of any animal species are known to produce sounds.
有蹄目动物的幼仔出生时处于发育的高级阶段，能够在几天内照料自己。
In ungulates, the young are born in an advanced stage of development and can fend for themselves in a few days.
不过直到现在，研究者才认识到两栖动物的幼仔可能也会在水下发出声音。
Until now though, researchers did not realise that amphibian larva might also produce sounds underwater.
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