Where does the columbian black tail chicken come from?

It is a hen bred in the UK just for Free Range & free Range Organic egg production. The name has a European Trade Mark and the hen and the eggs she lays are exclusive to the UK supermarket Waitrose.

The farms on which the hens live are all members of 'The Guild of Columbian Blacktail producers' and meet regularly to share best Free range production techniques and practises