Following Ian Hubert's ["Lazy Moth Tutorial" ] (https://www.youtube.com/watch?v=imkSdlbXB_U) I was inspired to create Low-Poly Bats which act the same way.

Included in file are:

* Collection of Bat objects with flapping Shape Keys created
* Emitter with properties of the Bat's flight pre-set for reference
* Physics, Movement, Boid Brain, and Render contain all you need to understand it
* Example Cube object for Boid Brain to "Follow the Leader"

Following his tutorial should answer any questions you might have.

TLDR; Import Bat collection and emitter, set whatever object you want them to orbit in the Boid Brain.