Yup, it's a one way service. Here's a brilliant (long) read on the wild ways of pigeons: http://www.nytimes.com/2015/03/05/magazine/the-pigeon-king-and-the-ponz

Yup, it's a one way service. Here's a brilliant (long) read on the wild ways of pigeons: http://www.nytimes.com/2015/03/05/magazine/the-pigeon-king-and-the-ponzi-scheme-that-shook-canada.html http://www.nytimes.com/2015/03/05/magazine/the-pigeon-king-a...