I died today due to what I think is a bug with tallbirds. Once they have aggroed the player, no mob (I've tried hounds, Mactusk, eyeplants, killerbees, and a few others) can take that aggro away despite how much they chomp on the tallbird's legs. Is the tallbird intended to lock its aggro on the player? I have not tested this in the base game fyi.
Aggro Tallbird Spawn in any other aggressive mob The tallbird will not defend itself against the other mob's attacks so long as its aggro on the player has not expired