A field guide to the surprising mental abilities of the most common animals living among us.
They're good at manipulating touch screens to get food rewards, for instance.
Also, a Canadian city goes after bullies and a Chicago alderman takes the war on pigeons to a new level.
It's like a bird mated with a rainbow.
London's most athletic vermin run the torch in this charming animation.
A wildlife expert and Smithsonian scientist help solve one of life's enduring urban mysteries.