It may be a female or an immature male. See the pictures on the bottom of Cornell's All About Birds Red-winged Blackbird page. Claire

Thanks, Jordanwalker, for responding to my question. It makes a lot of sense that those are the Blue Jay's eggs. They seem too big to be the Cardinal's eggs and we have a lot of Blue jays here. The missing egg theory is interesting and it's kind of scary too for them to eat their own eggs/nestings! In some ways I'm not too surprised too as they're pretty aggressive birds. One Summer, they built a nest over out garden arch and three little birds hatched. The parents were very protective of them and kept sqawking at us whenever we walked under the nest. They always bully other birds including the Cardinals that regularly visit our garden. The Cardinals aren't aggressive, but they sure are brave enough to not to give up their ground easily.

looks like a female bobwhite quail to me...

That's a male so-called "English house sparrow"(Passer domesticus), an invasive species that is neither English nor a true sparrow, but an African weaver finch. These prolific birds are very messy and destroy nests of many cavity-nesting native bird species in order to build their own bulky nests in their places.