Check out Realistic 3D model of Ostrich with RIG and texture pack 3D model on CGTrader for $500. High-quality Polygon mesh mesh by Yuriy-Dulich: 16536 polys, 16586 vertices. Rigged, Textured, UV Mapped.
MA (Autodesk Maya, filesize: 13.2 MB), TEXTURES (Textures, filesize: 3.86 GB)