Awesome job, Alfredo,

Here is an excerpt from wikipedia on House Sparrow diets. Looks like a trip around the backyard would yield an easy meal for him/her.

As an adult, the House Sparrow mostly feeds on the seeds of grains and weeds, but it is opportunistic and adaptable, and eats whatever foods are available.[104] It can perform complex and unusual tasks to obtain food, such as opening automatic doors to enter supermarkets,[105] clinging to hotel walls to watch vacationers on their balconies,[106] and nectar robbing kowhai flowers.[107] In common with many other birds, the House Sparrow requires grit to digest the hard seeds in its diet. Grit can be either stone, often grains of masonry, or the shells of eggs or snails; oblong and rough grains are preferred.[108][109]

Several studies of the House Sparrow in temperate agricultural areas have found the proportion of seeds in its diet to be about 90 percent.[104][110][111] It will eat almost any seeds, but where it has a choice, it prefers oats and wheat.[112] In urban areas, the House Sparrow feeds largely on food provided directly or indirectly by humans, such as bread, though it prefers raw seeds.[111][113] The House Sparrow also eats berries and fruits, and it can survive without water in arid areas by ingesting moisture from berries.[96] In temperate areas, the House Sparrow has an unusual habit of tearing flowers, especially yellow ones, in the spring.[114]

Animals form another important part of the House Sparrow's diet, chiefly insects, of which beetles, caterpillars, dipteran flies, and aphids are especially important. Various non-insect arthropods are eaten, as are molluscs and crustaceans where available, earthworms, and even vertebrates such as lizards and frogs.[104] Nestling House Sparrows are fed mostly on insects until about fifteen days after hatching.[115] They are also given small quantities of seeds, spiders, and grit. In most places, grasshoppers and crickets are most the abundant foods of nestlings.[116] True bugs, ants, sawflies, and beetles are also important, but House Sparrows will take advantage of whatever food is most abundant to feed their nestlings.[116][117][118]

Full article. Sounds like they are pretty smart birds. Check out the article.