I want to order a few Sumatras from Ideal and Cackle this year, but I have a few questions. Are Sumatras aggressive? Are they more cannibalistic than other breeds? Are the roosters mean/fighters (with other roosters- I keep a mixed flock that includes several roosters in one pen sometimes)? Are they cold weather hardy? Do they tolerate confinement and docile breeds? Are they friendly? If you've had a Sumatra please comment! Thanks!