Note 16 — Chapter VI

In one instance, at least, Darwin had pictured in his imagination the steps by which a "strange and odious instinct" may have been developed from comparatively innocent beginnings. He was referring to the ejection by the young cuckoo of its companions from the nest. "I can see no special difficulty in its having gradually acquired, during successive generations, the blind desire, the strength and structure necessary for the work of ejection." "The first step towards the acquisition of the proper instinct might have been mere unintentional restlessness on the part of the young bird."—Origin of Species, p. 200.