From https://www.npr.org/sections/thetwo-way/2011/11/03/141946751/along-with-humans-who-else-is-in-the-7-billion-club
Bacteria total 1,000,000 million tons
Ants (many species) 3,000 million tons
Marine fish (many species) 800-2,000 million tons
Cattle (Bos taurus) 520 million tons
Termites (many species) 445 million tons
Humans (Homo sapiens) 350 million tons
Antarctic krill (Euphausia suberba) 150 million tons
From https://www.npr.org/sections/thetwo-way/2011/11/03/141946751/along-with-humans-who-else-is-in-the-7-billion-club
Bacteria total 1,000,000 million tons
Ants (many species) 3,000 million tons
Marine fish (many species) 800-2,000 million tons
Cattle (Bos taurus) 520 million tons
Termites (many species) 445 million tons
Humans (Homo sapiens) 350 million tons
Antarctic krill (Euphausia suberba) 150 million tons