Moscow’s stray dogs have begun using the city’s subway system. Zoologist Andrey Poyarkov of the Moscow Ecology and Evolution Institute, who has been studying the city’s 35,000 strays for 30 years, says some dogs scavenge downtown during the day and board trains in the evening to travel to industrial complexes in the suburbs, where they sleep.

“Because the best scavenging for food is in the city center,” Poyarkov told the Sun, “the dogs had to learn how to travel on the subway — to get to the center in the morning, then back home in the evening, just like people.”