Mastaban Tomb Sparrows

On occasion, bird pets buried with dignitaries and their families in Eqypt and the Sudan somehow regained the power of a "second life".
It has been theorized that the embalming process might have worked in reverse for non-human corpses, providing months or even years of life for those animal companions unfortunate to have been buried alive alongside their owners.
Fruits and vegetables buried with the family and even decaying flesh might have provided enough nourishment for these small birds.