Shrewdshrew Tails can be obtained from Shrewdshrews of course, either by killing them or taming them and harvesting from them after they have become your Pets. Shrewdshrews are peaceful mouse-like creatures with a leaf-like extension on their heads that hop around in Savannah-biomes. Be careful when attacking them or attempting to tame them, as they can inflict fire damage, and will even be able to set inflammable materials around you on fire, including Savannah Tallgrass, Shrubs and Parchwood-trees.