鉤爪

1. Origins, structure, and basic meaning

• Structure: 鉤爪 (かぎづめ) means a hooked claw or talon. 鉤爪で marks an instrument for gripping, while 鉤爪が makes the claw the subject leaving a mark.
• Basic usage: A hawk grips a branch with its talons; a monster's claw leaves a deep trace in rock.

2. Common pitfalls and similar expressions

• Claw used as an instrument and claw acting as subject
  • The first で makes a body part the means of an action; the second が promotes it to grammatical subject. The possessors 鷹 and 怪物 also differ.