*UPDATE
The new update is now live. I have added a new setting on the Parent class (BP_NPC_Bird_Base)
The setting is called “BirdCalls while Flying” You can set this to True or False (Bool). You can set this on the Parent Class for all the Birds, or you can set it on a per Bird basis.
In your case, when its night time you can cast to “BP_NPC_Bird_Base” and set “BirdCalls while Flying” to False, then at daybreak you can do the same and set it to true. This setting is for when the Birds are in flight.
Keep in mind there are still some Idle animations that have Bird calls on them- in your case you may wish to remove those animations in the Animation Blueprints. These play during certain perching and ground Idle animations. These sounds are attached to the animations themselves so that they sync together perfectly.
Also in this new update I have improved the Perching System. Enjoy everyone. 