Chickens are not nasty or mean, they are simply protecting the flock! Every newcomer to the flock represents a threat--could very well bring in deadly diseases, could usurp valuable space, food and water and endanger the flock. That is why you can't just throw them together. You've gotten some good advice--make sure you have lots of room, at least two feeders, and go very slow--I keep them "separated but visible" for at least 3 weeks before introduction.
Here's a really good article on introductions:
https://www.backyardchickens.com/web/viewblog.php?id=2593-adding-to-your-flock
Here's a really good article on introductions:
https://www.backyardchickens.com/web/viewblog.php?id=2593-adding-to-your-flock
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