I recently came across this youtube channel:
https://www.youtube.com/channel/UCu2uMM ... 4GmUIWmhDg
It's a channel of nothing other than cat specific clips. From computer animated play videos, to birds, robins, seagulls, squirrels, and more.
My cat loves these two videos:
She would stare and get close to see if she can get to them. My cat is now increasing difficult to engage in sustained play... so sometimes I just give up and let her watch a little TV.