The platypus is born completely defenseless and blind , cannot thermoregulate or find food on its own , and stays attached to its mother for weeks after birth .

鸭嘴兽出生时眼盲而且完全没有防卫能力，无法自行调节体温，也无法觅食，出生之后必须紧随其母长达数周之久。

And among garter snakes , male-on-male contact may allow some solitary males to thermoregulate and , therefore , survive .

在花斑蛇之间，同性的亲昵可以让一些落单的雄性获得体温，从而得以生存。