Who else thinks that these should be able to build wooden spike walls and dams when tamed?

They know longer cut the weight of wood by 1/4. They reduced it to 1/2.

If you carry a wild Castoroides and put it in your waters it will make its own dam. Easy materials in bulk!

Not about the beaver
Who else thinks that there should be a giant platypus In ark

They’re awesome for wood I got 300 wood for a single tree with one of these guys

Imagine harvesting a redwood tree!
-WhiteWinterTiger

This creature has a bonus where all wood placed on him will way significantly less. So Pitt all your wood on him

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.

Increase damage only and bring mammoths to carry the wood

Wild castoroides sometimes build dams which can contain cementing paste, wood, silica pearls, rare flowers and mushrooms. But accessing the inventory of a dam will make the beavers angry so watch out!