This is a story about Opie and Karma.
Most days the two cats cuddle on a bed upstairs in the Saratoga Springs, N.Y., home of Aray Till, a freelance creative director. One recent afternoon, though, they were startled by the sound of chirping birds in the living room downstairs.
They bounded down the staircase and were transfixed by two blue jays they saw sparring over seeds on the television screen. Opie swatted at the glass, while Karma sat upright, a vigilant sentry.
Ms. Till had recently discovered
“cat TV” on Amazon Prime,
a library of streaming videos and movies that feature birds, squirrels and other creatures, and were made to entertain felines...