Debate over free-range hen welfare - BBC News
How can you tell if a chicken is happy?
5 questions with animal welfare scientist Christine Nicol - Canadian Poultry MagazineCanadian Poultry Magazine
Some free-range chicken farms treat animals no better than caged ones | news.com.au — Australia's leading news site
Features | Campbell Centre for the Study of Animal Welfare
Test cages with three colored perches (other enclosing wire walls have... | Download Scientific Diagram
Christine NICOL | Professor of Animal Welfare | Royal Veterinary College, London | RVC | Research profile
Happier Chickens | TIME
The egg debate: free range or caged?
Take part in ground-breaking research to help pet chickens | British Hen Welfare Trust
What Does Cage-Free Eggs Mean?
Caged hens are 'happier than free-range'
What do chickens want? A veranda | Farming | The Guardian
UK free range egg production welfare standards amongst some of the best in the world - FarmingUK News
Chicken Behavior: An Overview of Recent Science
Poultry Feathers and Skin
Free range 'less humane than a cage' for hens, expert says
REF Case study search
Christine NICOL | Professor of Animal Welfare | Royal Veterinary College, London | RVC | Research profile
Features | Campbell Centre for the Study of Animal Welfare
How to allay egg consumers' welfare concerns | WATTPoultry
Professor Christine Nicol | Compassion in World Farming
