This is a scene in the age of dinosaurs, with animation authored and exported from Creature into UE4. This shows 200+ Creature Characters in realtime running with the Creature UE4 Plugin.
Video is here: [video]https://youtu.be/HWdnUODioko[/video]
You can grab the Creature Animation Plugin from the Github Repository here:
The actual demo is here:
Creature Animation is an advanced 2D animation tool that does both Bone and Mesh deformation with UE4 Plugin support.
More info here: