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Sorry, the number I had was 51% from New Scientist - https://www.newscientist.com/article/2294549-female-african-elephants-evolved-to-lose-tusks-due-to-ivory-po

• wahern 3y ago
  Ah. TIL male African elephants must have tusks to be viable, but male Asian elephants can be tuskless, and in some regions up to 90% of male Asian elephants can be tuskless (per https://nationalzoo.si.edu/animals/asian-elephant https://nationalzoo.si.edu/animals/asian-elephant). Regarding the female African elephant percentage discrepancy, both of which seem to be pulled from the same paper, it seems 33% refers to new born and 51% refers to all females.