Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.3
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
4429
Points per Word
0.000226
Page Count
32
Points per Page
0.03125
Series
Prehistoric Field Guides
Description
After the dinosaurs disappeared, a new form of life began to thrive on Earth. This final book in the series traces the emergence of mammals, from woolly mammoths to killer pigs to humans.