These cats are seriously smart. The duo see some birds outside and can hear them singing through the window. As they stare captivated by their prey, they begin to make little chirping sounds just like the birds!
You might not believe it, but it's actually a very advanced hunting skill. Cats are often able to fool little birds into thinking that they're really harmless, big, ugly birds with really crappy singing skills. Then, when they least expect it - kitty pounces!
Have a listen to these incredible little indoor hunters!