蝌蚪在蛙体内生长蛙类是体外受精的动物,孵化成活率不高,全靠大量产卵来延续种族。有一些蛙种具有保护后代的特殊本领,在美洲,有的母蛙背部长有蜂窝状小窝,有的公蛙背部有折皱,让受精卵在背部孵化成蝌蚪再独立生活。澳大利亚有一种蛀产卵受精后,把受精卵吞进体内,胃成为临时子宫,卵在胃里孵化,发育生长,变做小蛙。临产时,一只只小蛙从 Tadpoles in the frog body growth of frogs are in vitro fertilization of animals, hatching survival rate is not high, thanks to massive spawning to extend the race. There are some species of frogs that have the special ability to protect their offspring. In the Americas, some frogs have honeycombed veins on their backs, and others have wrinkles on their backs to allow them to hatch into tadpoles on their backs and live independently. Australia has a wormy fertilized eggs after fertilization, swallowing fertilized eggs into the body, the stomach becomes a temporary uterus, eggs hatch in the stomach, the development of growth, become a small frog. During labor, only a frog from