Risk-Taking+Behavior+STD

Everyone else is doing it. http://www.theverge.com/2017/3/2/14792602/turkeys-circling-dead-cat-animal-behavior-twitter-video?yptr=yahoo

Mammoths that slipped into the hole found it difficult to escape. Researchers measuring the pelvic bones of the remains have determined that most of the victims were young males.[2] A hypothesis drawn from observations of modern elephants' matriarchal societies, in which these group members are expelled, concludes that this group was inclined to the risk-taking behavior that led to their entrapment.[2]

https://en.wikipedia.org/wiki/Mammoth_Site,_Hot_Springs#cite_note-nathist-2

The fossil record shows that mammoth tusks grew rings—just a like a tree, except mammoth tusks can record weeks or even days in a mammoth’s life. From the width of rings and their isotopic makeup, we know that mammoth mothers nursed their young for two or three years. In teenage males, the growth rings in the tusks become suddenly narrow, indicating that the male suddenly had to fend for itself (the equivalent of going from your parents’ home-cooked meals to the macaroni and cheese and ramen diets of your first apartment).

Not all teenaged mammoths survived this dangerous period of isolation; at the Hot Springs Mammoth Site, paleontologists have uncovered a number of single, adolescent male skeletons that fell in the sinkhole and perished, one after the other through time.

Scientific American