Salt free saltines? Salt won't be doing this young bird any favors. Try an eye dropper with water or liquefied food. Darkness from a towel or cloth over the box should calm it. It looks a beat up, missing feathers. Could have internal injuries too. if you are successful hand feeding it, it will build a bit of trust. Good luck. Looked up Sparrow diets... >Sparrows in the wild primarily eat a variety of seeds and grains, including: Grass seeds: Such as ragweed and crabgrass. 1 Insects: Including beetles, caterpillars, and aphids. 1 Fruits and berries: They consume berries when available. 1 Other plant materials: They may also eat leaves and flowers. 1 >Overall, sparrows are omnivores and have a diverse diet that allows them to thrive in various environments. 2