Animal Attraction
National Geographic
1998

What is the mating game about – who does the choosing and what are the characteristics sought after throughout the animal kingdom, including us? Animal Attraction answers all of these questions.

Play: The Nature of the Game
National Geographic
1994

Play reveals the significance of playfulness both as a precursor to culture – connecting the genetic past with learning – and as a means of allowing us to adapt to our environment. By the 1950s, ethnologists recognized that cavorting is extremely important in developing motor and social skills. Today, play behavior is recognized as a biological imperative, affecting the lives of all warm-blooded creatures including man and birds.