Within days of being deposited on a leaf overhanging a stream, tree frog eggs grow into recognizable tadpoles.Bulbous yolk sacs provide nourishment.

• 树蛙的蛋存留在一片树叶上流出的汁液中，逐渐孵化成可以辨认的蝌蚪模样，球形的蛋黄囊为蝌蚪们提供营养。