No They will not kill a chicken but they likely will not eat leeks. Leeks are part of the onion family of plants and unless the leeks are very young and just breaking the surface of the soil, a chicken will most likey ignore it.
Yes However, here is something you may want to consider. Foods with strong flavors such as leeks, onions, garlic, and so on may actually have an effect on the taste of the eggs they produce. If you are keeping the chickens for laying purposes, this might not be something you desire.
Yes, bobcats kill and eat chickens.
You can't. That is impossible. The only way to get feathers on Minecraft is from chickens.
2207 chickens
Not if you mean "man-eating chickens" Chickens, being omnivores, will kill and eat small rodents and other animals. So the answer is yes, chickens can and will kill for food.
it can transfer diseases to human like bird flue ... !
No.
people
Generally, predators kill chickens. Not prey. :P Most medium sized carnivores will kill chickens. Dogs, foxes, coyotes, weasels, etc. Not sure about cats, but they could probably kill bantams with no trouble.
possibly.
We eat the cows and chickens. They are food. The same cannot be said of cats and dogs in most cultures. In most cultures we do not kill pets, not even when they are cows and chickens.
Yes, raccoons will kill and eat chickens if they are not well secured.