A red squirrel on a branch looks built for fairy tales; its biology is built for war. Evolution has tuned this animal not for cuddling on a sofa but for relentless cutting, shredding and fleeing through trees at high speed.At the core is rodent dentition: ever‑growing incisors with enamel and dentin arranged to form a self‑sharpening chisel. To prevent malocclusion and overgrowth, the animal must ...More