Chickens cannot wear the identification that works for horses and pigs, and a Leghorn adds two difficulties of its own: the breed is uniformly white, and it is one of the flightiest, most athletic layers, quite capable of clearing a fence that would hold heavier hens. Identification for a Leghorn is therefore a system rather than an object: a numbered leg band on the bird, that number recorded against your contact details at home, and close photographs of the small features that separate this white hen from every other white hen.
Band the Leg and Write the Number Down Properly
Fit a leg band sized for a Leghorn's slim leg, snug enough not to slide over the foot or catch on wire, and check it as the bird matures because a band that was right for a pullet can tighten on a grown hen. The band only identifies her if its number or colour is recorded somewhere a finder can connect to you, so keep a flock book, paper or digital, listing each band against the bird, your name, and your phone number. A band whose number exists only in your memory identifies nothing when someone else is holding the hen and trying to describe her.
Photograph the Comb, Not Just the Hen
A general photo of a white chicken is nearly useless for matching. Get close instead: photograph the single comb from the side to capture its size, flop, and any notch or bend, the white earlobe, the tail angle and any crooked feather, and any scale pattern, spur bud, or mark on the legs. Leghorns are individuals in these details even when their plumage is identical. Keep the photos with the band record, dated by the bird's stage of growth, and refresh them after a moult, when combs pale and tails regrow and last season's portrait stops matching the bird in a neighbour's run.
Accept That a Finder Needs a Route to You
A loose Leghorn will usually be caught by a neighbour or found sheltering in another flock, and that person has no way to read your flock book. Make the connection easy in advance: let nearby poultry keepers know your birds wear a particular band colour, tell them your number, and respond fast when a white hen is reported, because finders often release or rehome a stray bird they cannot place within a day or two. If your hens free-range near a boundary, a small notice with your number given directly to adjoining households does more than any band alone.
Check Bands During Routine Handling
Build band checks into the handling you already do: when you treat feet, trim, or move birds between pens, confirm each band is present, legible, and comfortable, and replace split or faded bands on the spot, updating the flock book at the same moment rather than later. Escapes cluster around pen moves, new fencing, and predator scares, which are exactly the times a missing band goes unnoticed in the rush. A two-minute check during calm handling is what makes the band reliable on the bad day.
Because the bird herself can carry so little, the alert around her matters, and KinsLe's Lost Pet Alert System gives a Leghorn keeper that reach: it sends a free alert to nearby Circle of Love members when she gets out, and whoever catches the white hen in their garden can message you directly instead of guessing which local flock she flew from.