like a hawk

“She heard Bell say into his phone, "Th'only person got close to the plane, 'cept for me and Percey, was the business manager, Ron Talbot — and, nothing personal to him, but my boys or I watched him like a hawk while he was doing the work, stood over his shoulder the whole time.”

The Coffin Dancer

“In the distance behind it Kirk could glimpse the deadly silver angularity of the Klingon battle cruiser Rapache, which had arrived at the base inexplicably early and was now in orbit, hanging like a hawk upon the winds of night.”

Simon & Schuster: Ishmael