No, they are burial mounds :)
Mounds or piles of dirt found in fields and yards are often the result of moles, voles or other underground burrowing animals. The mounds are the dirt left behind from their excavations.
The height of mound builder mounds varied greatly, ranging from a few feet to over 70 feet (21 meters) tall. The largest mounds were typically ceremonial or burial mounds, while smaller mounds were used for various purposes such as platforms for buildings or as lookout points.
Ants Tunnelling and removing dirt
They built mounds out of dirt from the grass lands and they put in valuable stuff to them and traded with other tribes.
from the ant hills that are mounds of dirt that normally have ants coming out
Mounds of dirt
In the dirt... Usually mounds or smaller piles of soil in order to do tricks. For more of a challenge, wet dirt, mud, is popular for dirt bikers.
Termites in Africa make huge dirt mounds however, in the US, hornets make dirt mounds by digging in the ground and making their nests in the ground. They can be very territorail pests beware if you go near their mounds they fly around you and buzz. They are easy to kill just make sure you have a net and rock ready.
they make it out of tons of dirt, stone or rock.
They moved dirt! P.S. you guys are idiots
They grow in small loamy dirt mounds.