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Across 1. % of all bird species on Earth that are extinct 4. %of California's indigenous languages that are extinct 5. #of scientists in the IUCN 7. rate of global extinction of species over past 500 years 8. %of humans that speak/think in 1 of the 10 dominant world languages 9. #of languages spoken in the past in South America 10. %of the 300 indigenous languages of the US's past that are extinct 12. #of indigenous languages spoken in past in California

Down 2. #of years in which 25% of all species could become extinct 3. Species of birds lost in past 1,000-2,000 years in Pacific islands 4. #of languages on Earth 6. #of languages of native speakers once spoken in the US 11. #of distinct Australian aboriginal languages spoken in the past