Did You Know? ... monkeys and apes love surprises... and other fun facts.

Try It! Build a special primate habitat in your own home.

By the Numbers How do animal behaviors add up?

Spotlight Visit all the monkeys and apes at the Philadelphia Zoo’s new Primate Reserve.

You can ask more, discover more, explore more — with all-new experiments, links, resources and ideas.

Cool Science Stuff: Take your new observation skills into the classroom — and take notes on how your classmates behave. Then take our online quiz to check out your “primate IQ.”

Resources: Ideas to help you and your child learn about primates.

Teachers: How find out why helps you meet the National Science Education Standards.

The orangutan pictured above resides at the San Diego Zoo. Photograph copyright Comstock/Russ Kinne.