Elephants have been hunting and killed by hunters for many years and have evolved without raising their tusks, research findings say.
Nearly 90% of African elephants in Goronosa National Park in Mozambique were slaughtered for ivory to raise weapons in civil war.
However, recent speculation suggested that about a third of the women who were born after the 1992 war were unable to develop tusks.
The male elephant's ivory is larger and heavier, but due to the increase in poaching, the hunter has begun to focus on women.
In an interview with National Geographic, Joyce Poole, a science director at a nonprofit organization called ElephantVoices, added: "As the elderly population grows, the percentage of women without toughness increases."
Other countries saw the number of elephants growing tusks changing.
In South Africa, 98% of the 174 women who live in Addo Elephant National Park did not grow tusks in the early 2000s.
Poaching also reduces the size of tusks in some hunting areas, such as southern Kenya.
Scientists say that elephants with this handicap can change how they behave.
Because tusks are used to dig water or to obtain bark for food, mammals can travel further to survive.
But researchers say that changing the way elephants live can have a bigger impact on the surrounding ecosystem.
Behavioral ecologist Ryan Long of the University of Idaho said in an interview with National Geographic: "This change in behavior can change the distribution of elephants throughout the landscape and affect the rest of the ecosystem.
The number of tuskless elephants indicates a constant impact on humans by animals.
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