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And they traveled all across the wooded areas of the Americas back around 50,000 and 500,000 years ago. And paleontologists had debated, they've been debating a long time why, and looked like these went extinct. The emerging picture involved, while one was increasing human influence on the landscape, and a warmer integration of climate that began to change the world's ecosystem. Also, humans over hunting was driving some of these animals to extinction as well. But, less understood is how the planet came to give rise to the entire community of these huge animals during the hypocene. And now there's a new study that's come out. On the success of this loss, and it's helping show how the world of these ice age giants came to be, and that the Earth became these enormous animals. It could come again. So, for the Museum of Natural History, there's a paleontologist there, Rachel Nertigy, and some of her colleagues. The Tract house loss came to be widespread in several parts of the places in America through that area. And they published their findings of science this past May. The researchers found that climate shifts, that a lot of the spread of grasslands gave rise to big flocks of these huge hanging animals. And then these animals altered throughout those habitats to maintain a lot of pieces, that's so that their big bodies keep moving long distances. So the interaction between the animals, the environment shows how giants obtain their massive size, and how weird it is that our planet has fewer big animals than it otherwise would have.