Mom Gorilla is frightened and panicked and drumming because she was hit by a rampaging Gentaro.

Gentaro slapped Genki. Genki was frightened of Gentaro when Gentaro hit him. Kintaro was worried about Genki and stuck close to him. (Gorilla family in the past)
Other videos include Kintaro eating ice with relish and Momotaro sitting on a tire.(Gorilla family in the present)
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I am writing it using translation site.If words are wrong, I am sorry.
This is a video of the Momotaro family taken some time ago.

[@user-eq2tv7so9z]

Genki is the sweetest ❤ I hate seeing her bullied by all the boys. I wish I could adopt her

[@sandraaguirre1906]

My poor Genki

[@dianearsineau3439]

Gentaro acted a little playful towards genki, and slap her on her arm , which genki didn't appreciate,she's such an gental gorilla, and kintaro came to her side following her outside ! 😮

[@user-on4uj6ri4r]

Yes ,he can be a bad gorilla torwards his mom ,Maybe this causes MoMo to respond toward him so often

[@dianamaciel4294]

Amo esses familia de gorilas

[@ana-tr8xk]

I hope the gorillas 🦍 don’t hear this all noise music shouting, made by the visitors ! It’s stressful for them ….

[@karenclifton9068]

Old video

[@normasantoro1087]

Gentaro is a handsome boy..but that boy can be naughty...don't like when he hits his mom.😡

[@360Fov]

That's not drumming, that's her anxiety hand movement; she does that gesture when she's stressed, or waiting for something (like the door to open).