For every 300 Muscovites, there's a stray dog wandering the streets
of Russia's capital. And according to Andrei Poyarkov, a researcher at
the A.N. Severtsov Institute of Ecology and Evolution, the fierce
pressure of urban living has driven the dogs
to evolve wolf-like traits, increased intelligence, and even the ability to navigate the subway.
Poyarkov has studied the dogs, which number about 35,000, for the
last 30 years. Over that time, he observed the stray dog population lose
the spotted coats, wagging tails, and friendliness that separate dogs
from wolves, while at the same time evolving social structures and
behaviors optimized to four ecological niches occupied by what Poyarkov
calls guard dogs, scavengers, wild dogs, and beggars.
The guard dogs follow around, and receive food from, the security
personnel at Moscow's many fenced in sites. They think the guards are
their masters, and serve as semi-feral assistants. The scavengers roam
the city eating garbage. The wild dogs are the most wolf-like, hunting
mice, rats, and cats under the cover of night.
But beggar dogs have evolved the most specialized behavior. Relying
on scraps of food from commuters, the beggar dogs can not only recognize
which humans are most likely to give them something to eat, but have
evolved to ride the subway. Using scents, and the ability to recognize
the train conductor's names for different stops, they incorporate many
stations into their territories.
Additionally, Poyarkov says the pack structure of the beggars
reflects a reliance on brain over brawn for survival. In the beggar
packs, the smartest dog, not the most physically dominant, occupies the
alpha male position.
The evolution of Moscow's stray dogs has been going on since at least
the mid-1800s, when Russian writers first mentioned the stray dog
problem in the city. And that evolution has been propelled by deadly
selective pressure. Most of the strays arrive on the streets as rejected
house pets. Of those dogs kicked out of their homes, Poyarkov estimates
fewer than 3 percent live long enough to breed. To survive those odds, a
dog really does have to be the fittest.
source: http://www.popsci.com/science/article/2010-01/moscows-stray-dogs-evolving-greater-intelligence-wolf-characteristics-and-mastery-subway