"Animal biomass" refers to the total amount of living organisms (animals) in a particular area or ecosystem. It measures the combined weight of all the animals in that area. Full definition
In fact, ants are so numerous that it is believed that they are responsible for around 12 to 20 percent of the total animal biomass on Earth. (techtimes.com)
As an ecologist, I would like to comment on a statement on the page: «A producing farm undoubtedly has a higher animal biomass than virgin forest as well as a higher photosynthetic rate. (coffeehabitat.com)
The human species, therefore, whilst comprising only half of 1 per cent of the global animal biomass, consumes a significant fraction of everything the Earth produces. (scientificamerican.com)