Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
5.2
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
2306
Points per Word
0.000217
Page Count
32
Points per Page
0.015625
Description
Pelycosaurs were lizardlike creatures that inhabited Earth long before dinosaurs first appeared. From sail-backed Dimetrodon to tiny Archaeothyris, pelycosaurs shared characteristics of both mammals and reptiles.