he then , with no external change of shape , evolved from happy dunce to killer ape , with spring-steel sinews , tiger-throttling paws , and fangs to match his famine-toughened jaws ; with twice the courage of a bear , and wile surpassing that of snake and crocodile ; with eyes as keen in darkness as in light , and ears that plucked a whisper from the night : a match for any predator alive -- a winner in the struggle to survive !