Beaver dams are usually about five feet high. They can be any length, from new ones only a few feet long to old ones that have been added to as the pond spreads out behind them until they are over a hundred feet in length.

• 河狸筑的坝通常大约5英尺高，长度任意有仅几英尺长的新坝，有因池塘扩大而形成的100多英尺长的老堤。