I've raised Sumatras for several years. They are some of the most unique chickens I've raised. They are a lot of fun and very energetic birds. They can sometimes be aggressive especially toward new birds. The females were originally imported from the island of Sumatra in Indonesia for the purpose of crossing to other breeds to infuse aggressiveness for fighting birds. They are extremely adaptable and have no problems with the Michigan winters or the summers. (-20 to 100). They like free-range but if caged make sure they have room to run and roost.