How do you explain?

This morning I found a baby bird lying in our driveway.  It must have fallen/been pushed out the nest last night.  It was dead and the ants had found it.

I told Aaron to be careful and to walk around it and he refused to move (I think he has my ‘ick’ gene).  I called Paul to come and remove the baby.

This all led to a discussion with Aaron about the fact that the baby bird was dead and that we would have to bury it.  He had lots of questions.

He wanted to know what happened to the bird.  He wanted to know what would happen to it after it was buried.  He wanted to know why it died and where its mommy and daddy were.

In Aarons short life two of his great grandparents have passed away.  We explained to him that they were in heaven with Gd and left it at that.  He was fine with that.

The difference here is that he actually saw the dead bird.  He wanted to know what we were going to do with it (bury it).

How do you explain to a 4 year old about death?