he gives them more food
he gives them territories with lots of females
he gives them more testosterone or progesterone
he threatens to bite them
They have more testosterone and progesterone when they are babies
They have different colored dewlaps
They are more aggressive
All of the above
They have territories
a chemical that is higher in women than in men
a type of lizard behavior
a type of tree lizard
a hormone in lizards and people
reading a book
running away from a fight
starting a fight
sharing toys at the playground
catching insects
communicating with other lizards
changing their hormone levels
warming themselves in the sun