This is a paid asset, but now you can download Bat Monster Beast Free.
Detail this asset from Unity Store: Original Link
Bat Monster Beast v1.0
This asset package contains 1 bat monster model and animations.
– 1 bat monster model.500 triangles.
– 5 bat monster animations.fast fly, slow fly, damage, attack, die.
– 1 texture 256×256.
– 1 demo scene.
Take a look at the screenshot images and video for more details.