• macaques in captivity and in the wild
• female mating behavior
  
• alloparental care
• biological and physiological measure of reproductive success
• the intersection of biology and culture
• the evolution of human behavior
• how biology and culture influence parenting styles

Books:

• 2001 Kids: How Biology and Culture Shape the Way We Raise Our Children. Doubleday.
• 1998 Our Babies, Ourselves: How Biology and Culture Shape the Way we Parent. Anchor Books (Doubleday).
• 1995 What's Love Got to do with it? The Evolution of Human Mating. Anchor Books (Doubleday).
• 1993 Female Choices: Sexual Behavior of Female Primates. Cornell University Press. Science Journalism:
• 2003 How many fathers are best for a child? Discover April.
• 2002 Mother's little helpers. New Scientist 181:44-47.  
• The happy fat. New Scientist 175:34-37.  
• What you can learn from dunk monkeys. Discover July: 41-44.  
• So near and yet so far. Natural History June: 76-77.  
• String theory. Natural History 111:14-15.
• Small, M.F. 2001 Do animals have culture? Scientific American 284:104-106.