nibbling

Hello, Can anyone tell me what my budgie is doing in this video? https://vimeo.com/195160780/e111a1e2b3 Some background info - he is a rescue budgie and my first bird! He is male, older than 1.5 years, and is a lone budgie who is never really alone as he keeps me company while I work from...

I have a lot of things hanging and lying around the room/cage, but Mila still looks for the plastic caps on the rope ends to chew on >: I tried to tie some rope ends around it but she still manages to get to them. I'm not sure if it's ok, since she probably won't eat the plastic and just nibble...