One-Fifth of Animal and Plant Species at Risk of Extinction 1.62K Max Read 10/27/10 12:30AM Filed to: uh oh uh oh Animals Extinction Conservation dodo species Science According to a new conservation study, one-fifth of all plant and animal species qualify for the Red List of Threatened Species, meaning they are "facing wipeout." So, basically, if we work hard, we can probably finish them off by 2100.