tl;dr: By biomass, cattle dominate animals at 650M tonnes, beating humans (350M) and Antarctic krill (379M), while sugar cane leads crops at 2B tonnes annually. But plants crush everything—the Black Spruce alone (~11B tonnes in Canada) and Russia's Dahurian Larch (8.4B+ tonnes) each contain roughly 3x more carbon than all animals on Earth combined. Bacteria (70B tons of carbon) also massively outweigh animals (2B tons), though an undiscovered deep-sea bacterium could potentially top the list.