Elephants develop in order not to grow their tusks after years of chasing and killing by poachers, reveals research.
Nearly 90 percent of African elephants in Mozambique Gorongosa National Park slaughtered the ivory to fund weapons in the country's civil war.
But about one third of women – the generation born after the war ended in 1992 – has not developed teeth, suggests new figures.
Male elephant slings are bigger and heavier, but due to increased poaching, hunters began to focus on women.
Joyce Poole, Scientific Director of an Ideal Organization, called ElephantVoices, told National Geographic: "With the age of the older age population, you start getting this really higher proportion of thousands of women."
Other countries have also seen a shift in the number of elephants growing teeth.
In South Africa, 98 percent of the 174 women in Addo Elephant National Park did not grow thousands in the early 2000s.
Poaching has also caused the size of the tusks to descend into some heavy hunting areas, such as southern Kenya.
Researchers say that the elephants with this disability can change how they behave.
Tusks are used to dig water or bark of trees for food, so mammals can travel further afield to find survival.
But researchers say changes in how elephants live can have more impact on ecosystems around them.
Ryan Long, a behavioral ecologist at Idaho University, told National Geographic: "Some or all of these changes in behavior can lead to changes in the distribution of elephants across the landscape, and these are the major changes that are most likely to affect the rest of the ecosystem .
The number of elephant elephants has indicated the lasting effect people have had on animals.
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