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A few good roof ice dams support pictures I found:

Oy


Image by jocelyndale
I’ve knocked down several icicles for safety factors, even though they form quite swiftly. This is the north side of the property. Fruther up the roof, we have numerous inches of snow with a strong inch of ice beneath. Near the best the ice is slooooowly melting, but I decided it was time to support it along.

Beaver Lodge


Image by *Kid*Doc*A single*
The ponds produced by well-maintained dams assist isolate the beavers’ residence, their lodge, which is also produced from severed branches and mud. The beavers cover their lodges late every autumn with fresh mud which freezes when the frost sets in. The mud becomes nearly as challenging as stone, so that neither wolves nor wolverines can get in.
The lodge has underwater entrances to make entry almost impossible for any other animal (even so, muskrats have been noticed living inside beaver lodges with the beavers who made it). A very little amount of the lodge is actually utilized as a living area. Contrary to common belief, beavers truly dig out their den with an underwater entrance right after they finish building the dam and lodge structure. There are typically two dens inside the lodge, 1 for drying off following exiting the water, and yet another, drier one particular exactly where the household in fact lives.
Their houses are formed of the exact same components as the dams, with small order or regularity of structure, and seldom include a lot more than four old, and six or eight young beavers. At times some of the bigger homes have 1 or a lot more partitions, but these are only posts of the major creating left by the builders to support the roof, for the apartments have normally no communication with each and every other except by water.
When the ice breaks up in spring they constantly leave their embankments, and rove about until a tiny before fall, when they return to their old habitations, and lay in their winter stock of wood. They seldom start to repair the homes till the frost sets in, and never ever finish the outer coating till the cold becomes severe. When they erect a new habitation they fell the wood early in summer, but seldom start creating till towards the end of August.
Source: en.wikipedia.org/wiki/Beaver_lodge#Lodges