Bird banding demands a particular kind of knowledge that lives in the hands. It’s a study in patience and precision, each bird requires a confident but impossibly gentle touch. The morphology of a tarsus memorized not from a diagram but from touch, repeated across hundreds of individuals until the motion becomes instinct. That dexterity is tested on cold winter and early spring mornings at the nets, when stiff fingers still have to move with the same care and speed regardless of the temperature. Science, at its most field-worn, is also a physical practice (a nice hot cup of tea also helps).