Birds Animation

Hi,

In the example below: how does animation stop when the birds are clicked, and layer content is reflected.

I could not locate a trigger to STOP animation of birds. 

https://360.articulate.com/review/content/df0a49f3-2ed0-42e6-8592-f57f0b278cb5/review?fbclid=IwAR11zf3-Bnsqi51CxZMivgx_DOKBARGOjSfzXWHZf6o6ok6kHuPncc5ak8E

regards

Malvika