Nutritional deficiencies are among the most common and preventable welfare problems in companion parrots, with all-seed diets causing widespread chronic illness.
Parrot nutritional welfare is a chronic welfare problem hiding behind the appearance of apparently healthy birds. A parrot eating seeds appears to eat well, but is slowly developing vitamin deficiencies that will manifest as disease years later. The all-seed diet is a welfare failure born from historical ignorance and the apparent acceptability of the diet to birds - parrots will choose high-fat seeds over nutritionally complete foods in the same way humans choose junk food. Educating parrot owners about species-appropriate nutrition is one of the highest-impact companion animal welfare interventions available.