Russian subway

Each morning, like clockwork, they board the subway. They're off to begin their daily routine amidst the hustle and bustle of the city.
But these aren't just any daily commuters. They are stray dogs who live on the outskirts of Moscow and commute on the underground to and from the city centre in search of food scraps.
Then after a hard day scavenging and begging on the streets, they hop back on the train and return to the suburbs where they spend the night.