Gorilla Kintaro is punched in the face by Gentaro, falls down and hits his head hard with a tree. 

Gentaro hits Kintaro. Kintaro fell backward. At that time, Kintaro hit his head hard with a wooden horn. (Gorilla family in the past)
Other videos include cute Kintaro making funny faces through the windowpane and Kintaro sitting on a red ball.(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.