Objects don't show in animation, but are there in a still frame render

I have some bats (a particle system rendering objects) flying out of a pumpkin’s mouth that don’t show up in the animation render, but will show up in a single image frame render. This is very short animation using evee, Blender 2.90.1. Any ideas why this happens and how to correct it?

I’ll look for the thread, but I remember the solution having something to do with an animation cache. The person said something like, “Are you using animation baking?” or “animation cache?”

Let me take a gander!

And here it is! It also deals with particles:

This usually happens when you don’t bake the particles, will show up fine in stills, but not animations.

Thanks so much, that was the issue.

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Glad I could help you find a solution!