We are juncos, sparrows, chickadees — the winter birds you see hopping in the snow. Winter storms kill 1 in 4 of us. But your old Christmas tree? It becomes a fortress. Under the branches: → Wind chill drops drastically → Predators like hawks lose sight of us → We conserve energy instead of freezing → We roost safely between needles In Germany, Austria, the USA — birds instinctively use discarded trees as natural windbreaks. But most trees get tossed onto curbs, where we can’t use them. A simple