Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Critter Pack Free.
Critter Pack v1.85
This is a critter pack, small animals that are part of the environment. Spider, rat, snake, frog, turtle, snail, butterfly, dragonfly, and bumblebee (new additions: cockroach, worm, bat and squirrel). Most of them have extra textures, adding additional variety.
Larger animals have 4 animations (move, idle, idle2, die), while smaller animals just have a move animation. All animals are skinned meshes, and all require one draw call to draw (no multi-material or multiple meshes per animal). They are also very low poly (300-ish per larger critters, 10 per small), and don’t have many bones (around 10 per big animal, smallers are just 2-4). So altogether they don’t take much resources and a lot of them can be on the screen simultaneously.
Textures are 256 pixels on larger ones, 64 on smaller ones.
Questions? Suggestions? Feel free to write to email@example.com