Why Did The Chicken Enter The Garage?

There is a chicken living in my garage. Really. Perhaps a brief explanation is in order then perhaps you might assist in unravelling the mystery of the garage chicken. We live in a flat in a complex of four villas that have an underground garage, which is accessed through a card operated automatic garage door type thing. The only other possible access is from the pool, reached by going down approximately 20 steps and navigating through some spiky vegetation. The only other option is the chicken climbing up to the main entrances of the four separate villas and taking the elevator down to the garage. The area we live in is largely residential, with some schools. To my knowledge, none of the surrounding houses have chicken coups, and there are no chicken farms anywhere in the vicinity.
So although we are accustomed to garage cats, encountering the chicken in the garage was quite a surrealist and novel experience. Most puzzling is that this chicken has now been living in the garage for over three weeks (we think), without any obvious signs of anyone feeding it initially. At one point my adorable mother, a budding Dr. Doolittle who has a track record of converting our parking places in the garage into an animal shelter, decided the garage chicken has to be fed. She then proceeded to pull out a 3kg bag of millet or wheat grains from somewhere in the kitchen. (Why she had this in the first place is beyond me and on the list of other mysteries to be solved at some point.) Thus, though not knowing from whence this chicken came, what its purpose is, or how it has survived in the garage for so long, we have now adopted the garage chicken. The laying of any (toxic/carfumed) eggs shall be reported immediately. Watch this space.

Disclaimer: I am not hallucinating/seeing mirages in the desert/high/insane. No chickens have been harmed in the writing of this post.