4 The yearling had a routine; his repair work
seemed to consistently involve scooping up
mud to patch seepage holes in the dam.
5 A kit eats while the adults groom.
6 An adult works on the secondary dam. Note
rocks being used as foundation.
7 Beavers use their tails as props on which to
balance as they cut trees, as rudders to
maneuver in water, as mason’s trowels as they
build dams and lodges, as alarm systems when
threatened, and as heat exchangers in winter.
8 As the dam grew it began to dwarf its engineers.
9 The rebuilt dam.