Vitruvian Man by Leonardo da Vinci
© Bettmann/CORBIS

Pennies
Ryan McVay, Photodisc

Chimpanzee using tool
© 2001 Carol Lofton/Distinctive Images

Ophthalmologist Performing Eye Surgery
© 2001 Corbis Royalty Free Images

Raven
Courtesy Bernd Heinrich

Child engaged in learning experiment
© 2001 WGBH Educational Foundation and Clear Blue Sky Productions, Inc.
All Rights Reserved


Chauvet Cave Art
Courtesy: Courtesy French Ministry of Culture and Communication

Orcas
© Kennan Ward/CORBIS

Young man using sign language
© 2001 WGBH Educational Foundation and Clear Blue Sky Productions, Inc.
All Rights Reserved

Ernst Mayr
Courtesy of Ernst Mayr Library, MCZ, Harvard University. Not to be reproduced without permission.

Beetles Image
Courtesy, Brian D. Farrell, Museum of Comparative Zoology

Bird
© 2000 www.arttoday.com

Bats
© 2000 www.arttoday.com