This is one of the largest Ice Age structures made of mammoth bones
Hunter-gatherers in what’s now Russia constructed the massive ring around 25,000 years ago
![mammoth bone structure](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2020/03/031620_bb_mammoth-bones_feat.jpg?fit=1028%2C579&ssl=1)
Bones from at least 60 mammoths went into constructing this giant ring, one of the oldest and largest Ice Age structures made of the animals’ bones, a study finds.
A. Pryor et al/Antiquity 2020