The nemonites were large, herbivorous, aquatic, bovines. They were very tough to capture, but worth it.
They lived on the planet Novus Kamino Prime. They were used as a source of food and transportation.
It was a rite of passage in a young clone's life, to rope a nemonite and bring it back to the Town Hall, so that he could show his strength, wit, and that he was worthy to serve the colonies.