Phenomenal tames. Excellent wood gatherers and I would put them up against the Bronto or Steg for berry gathering, especially for smaller tribes. They don't gather as much per attack as either of the above, but they are orders of magnitude faster. Can zip around spamming attack and be at you weight limit in berries in no time.
Built our base on The Center right next to a pond with our trough just out of range. Tamed a couple of the beavers (named Sharon Stone and Wynonna because I dare you to come up with two better beaver names) for berry and wood gathering. Still get spawns and 3 to 5 dams. Never ending supply of cementing paste, silica pearls, rare flowers, mushrooms and more wood than we know what to do with.
Its saddle works as a smithy. However, unlike the actual smithy structure, the beaver can hold about 300 stacks of objects, opposed to the smithy’s 75. This allows you to craft ascended stuff that otherwise would be impossible (due to the crafting requirements asking for more materials than you can fit into the smithy). It’s also extremely handy if you are doing multiple Behemoth gates.
Seems to harvest more wood per hit than a mammoth, but the mammoth has better weight reduction, so just get your hairy-elephant to follow your splinter-mouse. Now admire the open plain where a proud forest once stood and laugh uncomfortably.
Their saddle acts as a mobile smithy, team it up with a horse to get the ultimate travelling team. The horse saddle = a smithy and the beaver saddle = mortar and pestle so you can craft gunpowder while on horse, and then transfer that to the beaver, so you can make your grenades and such on the go.
How to build dam farm:
12 foundations (preferably stone)
12-24 doorframe (preferably stone)
1)find an already existing dam
2)build a 3x3 box around the dam with fence foundations
3)place doorframe on top of the foundations;if the dam is underwater, put enough layers for the top doorframe to be out of the water
4)using an argie, pick up 2 to 3 beavers and drop them into the box. 2 is the minimum number needed for them to spawn a dam but I find that 3 works better. (note:if you want more dams, bring beavers from another spawn location as no more beavers will naturally spawn in that area. Its also preferable to build another box so they don't end up pushing each other out the top)
Dams will spawn around every 12 hours
Remember to not leave the items you don't want in the dam. Drop them so that the beavers can spawn a new one without having the dam demolish after a week.