Poaching is altering the genetics of wild animals

[douglas9]

Sometime in the distant past, well before humans walked the Earth, the ancestors of modern-day elephants evolved their iconic tusks. Elephants use their bleach-white incisors — they’re technically giant teeth, like ours but longer — to dig, collect food, and protect themselves.

Then Homo sapiens arrived, and elephant tusks became a liability. Poachers kill the massive animals for their tusks, which are worth about $330 a pound wholesale as of 2017. Hunters slaughter roughly 20,000 elephants a year to supply the global ivory trade, according to the World Wildlife Fund.

But just as tusks evolved because they provide a number of benefits, a striking new study shows that some populations of African elephants have rapidly evolved to become tusk–less. Published in the journal Science, the paper’s authors found that many elephants in a park in Mozambique, which were heavily hunted for their ivory during a civil war a few decades ago, have lost their tusks — presumably because tuskless elephants are more likely to survive and pass the trait on to their offspring.



https://www.vox.com/down-to-earth/22735163/elephant-tusks-genetics-evolution-adaptation-hunting