I used to think that before I witnessed my indoor cat leap off the back deck and snatch a goldfinch that had landed on one of the coneflowers behind the deck........
FWIW, she hunts off the deck and has repeatedly caught mice and baby rabbits in the garden area on the back of it........
It's very disconcerting when I'm in the den and suddenly hear a squealing from the dining area of a creature my cat has just brought into the house...........(open pet entrance attached to my back deck doorwall.....)
But how many days a week does she land a bird?