As to the second half of your comment, you may be interested in this (mammal and bird biomass estimates): https://ourworldindata.org/wild-mammals-birds-biomass

As to the second half of your comment, you may be interested in this (mammal and bird biomass estimates): https://ourworldindata.org/wild-mammals-birds-biomass https://ourworldindata.org/wild-mammals-birds-biomass