scruff

Peter Brownの'The Wild Robot'を読んでいます。'The Mountain Rumble' の章から引用します。

On his way down, RECO 2 squeezed the trigger. There was a flash of blazing light and the walls begun to crumble. Nettle grabbed her brother by the scruff and pulled him outside as an avalanche of rock thundered behind him.

"scruff" は体のどの部分でしょうか？

・Collins Dictionary: the nape of the neck (esp in the phrase by the scruff of the neck): Yet none could take this game by the scruff of the neck.
・Cambridge English Dictionary: by the scruff of the/your neck : Cats carry their kittens by the scruff of the neck.
・Wiktionary: The loose skin at the back of the neck of some animals.; (rare) The back of the neck, nape; also scruff of the neck.: He grabbed his unruly child by the scruff of the neck, and took him home
Usage notes: Strictly refers to the loose skin at the back of the neck – found on many mammals, though not humans – rather than the back of the neck itself. While this distinction is not always observed, scruff is used almost exclusively in the phrase “to grab [someone/something] by the scruff [of the neck]”.

なるほど、有名な運送会社のロゴマークを思い出しますね。