Hens or otherwise known as chickens 🐔 are one of the most common and widespread domestic animals, with a total population of more than 19 billion as of 2011.
- Where did they come from? Genetic studies have pointed to multiple maternal origins in South Asia, Southeast Asia, and East Asia, but with the clade found in the Americas, Europe, the Middle East, and Africa originating in the Indian subcontinent.
- How do they act? Chickens are gregarious birds and live together in flocks. They have a communal approach to the incubation of eggs and raising of young. Individual chickens in a flock will dominate others, establishing the infamous "pecking order", with dominant individuals having priority for food access and nesting locations.