No, it is not really possible to drown in quick sand. In a holly wood movie, yes many people have drowned in quick sand, but in real life - no, it is not possible. You will descend up to your waist, but will down no further! Quick sand has a higher density than a human. This makes it impossible for a human or an animal to sink. Even objects with a higher density than quicksand will float on it, until they move.

Read more from the below link to know more about this:

https://www.bbc.com/future/article/20160323-can-quicksand-really-suck-you-to-your-death

I found an answer from en.wikipedia.org

Elephant - Wikipedia

Elephants are mammals of the family Elephantidae and the largest existing land animals. Three species are currently recognised: the African bush elephant, the ...

For more information, see Elephant - Wikipedia