Each creature/object is animated with its own keyframes in Blender and appears to be working in that software. But when we export over into Spark AR, only one creature/object appears to animate, the rest stay still.
I tried to export the file normally, and expected each creature/object to move like they do in Blender. However, each stays in its first frame position, except for the first, which animates properly.
In order to add fbx's to the project with multiple animated models, we had to set some pretty significant and not necessarily intuitive flags during the export process.
Need to set the "NLA Strips" and "All Actions" to FALSE when exporting a file with multiple objects that are animated.