The bulk update request #12903 is pending approval.
remove alias small_pred (0) -> invalid_tag (4)
create alias small_prey (9) -> larger_pred (7545)
create alias large_pred (16) -> larger_pred (7545)
create alias large_prey (73) -> smaller_pred (1913)
Reason: Not many posts under those tags but someone said only small_pred was aliased to invalid.
I think aliasing all of them to proper tags is better than invalidating.