As for the picture of a chicken with a weird thing on its beak, I think I may have an explanation. During the holiday season this year, the chests looked like presents. If it was the holiday season up until the day after the day after Christmas, and you had bonus chests on, that may be the answer. Other than that, I have no clue what it could mean. I also was told by a friend that there is no more Herobrine.