Blend shapes 3D models enable adjustable deformations (e.g., facial expressions) by blending target shapes with a base model, while animal 3D models are digital depictions of animals for static or animated use.
Blend shapes focus on dynamic changes—like making a character frown—common in animation. Animal models center on animal form (realistic/stylized) and may use blend shapes but are defined by their subject.
For expressive characters, use blend shapes; for animal assets, pick models optimized for your project (e.g., rigged for movement).