| [Beaver World] | Frontispiece |
| [A Young Beaver on the side of a Beaver House] | 6 |
| [A Young Beaver Sunning Himself] | 22 |
| [In the Harvest-Field] | 32 |
| Aspens cut by Beaver. |
| [Beaver Ponds] | 42 |
| [A New Dam] | 66 |
| [Part of an Old Dam 1040 Feet Long] | 78 |
| [The Spruce Tree House and Food-Pile, October 12] | 92 |
| [Lake-Bed Canals at Lily Lake, October, 1911] | 102 |
| [Section of a 750-foot Canal at Lily Lake] | 102 |
| [Plan of Beaver Colony on Jefferson River, near Three Forks, Montana] | 108 |
| [An Unplastered and a Plastered House] | 124 |
| [The 334-foot Canal] | 140 |
| [Plan of Moraine Colony, with Dead-Wood Dam] | 144 |
| [The Dead-Wood Dam] | 148 |
| [The Moraine House before and after Enlargement] | 168 |
| [House in Lily Lake] | 180 |
| [House, Food-Pile, Pond, and Dam in Winter] | 198 |
| [Where Beaver formerly lived and spread Soil] | 218 |