Butterflies /
Laura Marsh.
- Washington, D.C. : National Geographic, c2010.
- 48 p. : col. ill., col. maps ; 24 cm.
- National Geographic readers Great migrations. .
Includes index. "As seen on the National Geographixc Channel"--Cover.
Introduces the migration patterns of monarch butterfies, describing the vast distances they cover, why they migrate, and the dangers they face along the way.