Thanks!
As for the bird, I tried a couple of experiments but couldn't get it to quite work. Plastic banging against plastic killed momentum and wasn't something I wanted in general, but rubber killed it even faster. I tried various solid and more hollow rubber against rubber for the beak hitting the cup, but it kept killing all momentum. If I had some rubber parts with air inside, maybe it would have had the bounce I wanted? Further testing required...and also I need to source some much older tires.
I actually did that for one of its earlier versions...That I forgot to record because I'm not used to doing WIP photos/videos. But I found hitting the frame more fun and gave it a better spin. Or at least seemed like better spinning to me, less restricted.