Chickens will say goodbye to a dying companion and then leave it alone
People believe that humans are the only ones that deal with death. Sadly, that is not the truth, many animals have their own special rituals when one of their species dies or when they have a dying companion. Chickens, for example, will come and say goodbye to each other when one is dying.
These animals will go to the fallen chicken and do soft clicks. Then, the rest of the group will leave. There are also times when the chickens will kill one of them because they sense something is wrong with it, like a disease. WalterDaSquirrel1259 said these facts are from a book called How To Speak Chicken.