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