Teratsutsuki is an ominous bird which is a specter described in "Konjaku Gazu Zoku Hyakki" (Continued Illustrations of the Many Demons Past and Present), a collection of specters' illustrations by Sekien TORIYAMA, and which looks like a peckerwood.
寺つつき（てらつつき）は、鳥山石燕の妖怪画集『今昔画図続百鬼』にある妖怪で、啄木鳥のような怪鳥。