Then it was they earned the title, "Busy Beaver"! How they worked! That was before the days of ubiquitous automobiles and the beavers had not become nocturnal in their habits. They swarmed everywhere. Certain ones were detailed to inspect the dam, make necessary repairs and maintain the water at the same level all the time. Others worked at the new house, piling sicks and mud into a heap. It grew, the dam was raised, so the water was maintained within a few inches of the top of the unfinished wall. Occasionally I caught a glimpse of some workers in the deep water or near the shores of the ponds; they were digging safety-firsts, water escapes for emergency use. These canals led from the house to either bank and connected with tunnels that had their openings concealed beneath the surface of the water. Thus, should their pond be drained suddenly, they could escape by the canals to their emergency homes beneath the bank. Other beavers worked in the aspen grove, felling trees and cutting them into lengths that could be pushed or pulled or rolled to the bank and floated down the stream. Their work was impeded by the jamming of the logs in a narrow rocky neck down which they had to be skidded into the water. Then the engineers decided upon the construction of a canal around the rocky falls. They started digging at a point upstream, beyond the troublesome neck, swung outward, away from the water to the fringe of aspens, then back again to the stream below the rocks. In all the canal was two hundred feet long, about two feet wide and averaged fifteen inches deep. For a time all other work was suspended, and night and day the whole population toiled on the canal. Apparently each beaver had his own section to dig, and each went about his work in his own way. With tooth and claw they worked. Often they cut slides or runways down the sides of the canal giving them roads up which they carried their loose dirt. For thirty-seven nights they toiled in the dry ditch, then turned water in, and completed the work of deepening the canal. This transportation system saved them much labor and delay, and provided a safe route to and from the grove, for they could dive into the water when their enemies attacked.