Simple repetitive but realistic(ish) animaterd butterfly to instantly import and drag into any scene. No setup required, will animate on Play in a simple but effective way. Use a script to move the GameObject parenting the butterfly object during gameplay to bring it to life!
Butterfly with animations made to satisfy a need for a demonstration I gave in Unity to a foundation degree class before I taught it full time for a bit.
This was built prior to the lesson and was noted to be handy as an asset by the students using it, so I released it on to the Unity Asset Store for free :)
Its simple but does the job and a bit better than the Tuscany demo found in the early Oculus Rift Unity Integrations, which was the inspiration for making a butterfly in the first place.