What Happened to the Four Tusked Elephants?

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Up until 8,000 years ago there were many different types of elephants, with different tusk and trunk shapes. Most common of these living alongside modern elephants for many years were the four tusked elephants. Why did these elephants evolve? What did they use their tusks for? And why did they die out just leaving the two tusked elephants.
Sources:
www.sciencedirect.com/science...
digital.csic.es/handle/10261/1...
www.britannica.com/animal/gom...

[@thhseeking]

Incidentally, your pronunciation of "Cuvieronius" is off. Cuvieronius is named after the French naturalist Baron Georges Cuvier. So the "C" is pronounced as a "K".

[@stankahuna5271]

Its so sad that modern elephants are selecting for no tusks, its also amazing how evolution can save the species watching natural selection working in real time, I'm torn...

[@j.b.335]

32.4 million years from now , when the octopus evolves into the next intelligence on this planet , they will find a long extinct skeleton of a platypus and wonder " wtf was this "

[@bitxuro]

I see an obvious advantage of not having chin tusks: the trunk has more freedom of movement.

[@ixisinvestigator6009]

ramayana anyone?

[@asepsisaficionado7376]

They all died at Pelennor Fields

[@YoungXelDong]

They went extinct when the easterlings attacked minas tirith

[@C-Rex1]

It's sad to think that such a successful species is now nearly teetering on the edge of extinction.

[@yueshijoorya601]

I always say, humans happened because Nature accidentally clicked on the "fast forward" and "shuffle" buttons at the same time.

[@everydayscience654]

Hindu epic Ramayana mentions 4 tusked elephants

[@furatburhan8422]

elephants have evolved into only two tusks

[@petersmythe6462]

"Mainly their large tusks."

[@dreamer6432]

4:23

[@SomeoneCommenting]

4:19

[@AnOpenMindedDrinker]

“Mammoths still survived in Beringia until 13,000 years ago, and a subset that evolved to be small (about the size of a large horse) survived on arctic islands until as recently as 4,000 years ago.”

[@toothclaw6985]

There are a couple reasons as to why lower tusks were lost.

[@roadhigher]

I just have the greatest smile on my face whenever you upload a video. Palaeobiology channels on KZbin are many but few delve into such interesting and unique creatures like you do with so much good information and effort put into it. One of my favourite channels on YT overall.

[@mushmush4980]

"Humans may have had something to do with the decline of gomphotheres."

[@matthewhburch6198]

If chin tusks disappeared during the most recent ice age, the reason might be very simple. Upper jaw tusks could be used with closed mouths. Lower jaw tusks likely required opening the mouth for most strenuous tasks like digging or scraping. Opening mouths more than necessary in very cold climates would be a significant caloric drain, even if not deadly. Fewer calories leads to smaller size and less mass to engage in battles for dominance in breeding season.

[@tomasvrabec1845]

"what happened to 4 tusked elephant?"