Table of Contents
Preface
Acknowledgments
INTRODUCTION
Time and a Continent
Origins
Places
Diversity of a Form
Form
Diversity
Identity
Identification Aids
Hypothesized Relationships of Living Species
Flow Diagram for Identification
Photographs to Aid Identification
Map of Distribution
SPECIES ACCOUNTS
Eight Species Found in the United States, Canada, and Mexico
Texas Horned Lizard (Phrynosoma cornutum)
Coast Horned Lizard (Phrynosoma coronatum)
Pygmy Horned Lizard (Phrynosoma douglasii)
Short-horned Lizard (Phrynosoma hernandesi)
Flat-tail Horned Lizard (Phrynosoma mcallii)
Roundtail Horned Lizard (Phrynosoma modestum)
Desert Horned Lizard (Phrynosoma platyrhinos)
Regal Horned Lizard (Phrynosoma solare)
Five Species Found Only in Mexico
Giant Horned Lizard (Phrynosoma asio)
Short-tail Horned Lizard (Phrynosoma braconnieri)
Rock Horned Lizard (Phrynosoma ditmarsi)
Mexican-plateau Horned Lizard (Phrynosoma orbiculare)
Bull Horned Lizard (Phrynosoma taurus)
Convergence
NATURAL HISTORY
Cycles of Activities
Days and Seasons
Energy and Growth
Enemies and Defense
Lurking Predators
Levels of Defense
Escaping Notice
Defending Oneself
Coming of Generations
Lizard to Lizard
Eggs
Live Births
Of Humans and Lizards
Yesterday
Today
Tomorrow
Selected References
Additional Captions
Index