The little tadpole about the size of a sesame seed is now made up of three layers: the ectoderm mesoderm and endoderm.

芝麻籽大小的小蝌蚪现在已经分成了三层：外胚层、中胚层和内胚层。

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Like most amphibians these begin life in a juvenile "tadpole" state, then metamorphose into the adult form — except for one species, the axolotl, which famously lives its entire life as a juvenile.

像大多数的两栖动物一样，它们从幼年的“蝌蚪”状态蜕变成成年的形式——蝾螈这个物种除外，众所周知，它一生都处于幼年状态。

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For instance, a certain kind of tadpole can tell the depth of the water it is swimming in by the pitch of a tone which is produced by its own lungs.

举个例子，有一种蝌蚪能感知它所游泳之处水的深度，它是通过某种自己肺部产生的声音的音调来判定的。

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Tadpole Rex, a book about a frog who finds his inner dinosaur, caught Bird's attention.

FORBES: Media

That means it is possible to be sure of the paternity of a tadpole.

ECONOMIST: Animal behaviour