Caiman - A huge species of crocodile (7 species).
Water snakes - A mud and water living snake (20 species).
dirt and mud
There are several. Water, mud, and air are some examples.
unicornsacromantulasthestralscentaurshippogriffs
landfills,mud,trash,hair,food,lead,ink.
Those are called "Amphibians". Examples are frogs and toads.
mud
sediment
Examples non artifact
The bottom dwellers on the ocean floors eat plankton and other smaller animals. The bottom of the ocean is a sustainable condition for plankton because they cannot move against a current and this leads them to be within reach of fish that feed on them.
The city dwellers can lead to physical and mental health issues
I Know some cliff dwellers were in arizona and new mexico. They used the cliff itself and mostly just rocks. I have been to a cliff dwelling in arizona called Montezuma's Castle. They were pretty basic. They used ladders made of wood to get up the cliff to their homes. They definitely used mud and rocks.
Mud is anon-example of gravity.