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This is a paid asset, but now you can download Birds and Insects particle effect Free.
Detail this asset from Unity Store: Original Link
Birds and Insects particle effect v1.0
A cool birds and insects effect particles for your 2D and 3D games. Work with all platforms, specially optimized for mobiles. This pack includes flying particles of
1. Bats
2. Bees
3. Black and white birds
4. Blue birds
5. Red birds
6. Orange birds
7. Redhorn birds
8. White Pigeon
9. Colored Pigeon
10. Butterflies
11. Dragon flies