The influence of male kittens on the object play of their female siblings

In a study of domestic cats a sharp increase in playful contacts with objects occurred in most animals at around 50 days after birth. However, this change was not observed in litters that contained only females. Possibly the males by playing a lot had a short-term activating effect on their sisters. In order to examine whether males stimulated their female siblings in this way, the object play of male and female kittens was measured from 42 to...