_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 Working like a Beaver One September day I saw a number of beaver at work upon a half-finished house. One part of the house had been carried up about two feet above the water, and against this were leaned numerous sticks, which stood upon the top of the foundation just above water-level. After these sticks were arranged, they were covered with turf and mud which the beaver scooped from the bottom of the pond. In bringing this earth covering up, the beaver invariably came out of the water at a given point, and over a short slide worn on the side of the house climbed up to the height where they were to deposit their load, which was carried in the fore paws. Then they edged round and put the mud-ball upon the house. From this point they descended directly to the water, but when they emerged with the next handful, they came out at the bottom of the slide, and again climbed up it.