Most likely for hibernation.
horny reptiles whom have a fetish for mud wrestling.
fish, specifically "mud" fish or lung fish.
Hello! Salamanders are amphibians that live in water and land. They dig in the mud so yeah. Theres your answer.
Mt.Vesuvius buried Pompeii under mud and ash. Herculaneum was also buried by the same volcano at the same event.
In River mud in the Nile in Africa. They are able to survive periods in a dried up river by breathing via lungs and buried in damp mud.
Herculaneum was buried under nearly 60 feet of superhot mud.
LITHIFICATION
Plants; mostly trees.
compaction
The water lilies have thick, fleshy creeping underwater stems that are buried in the mud.
I have a mud turtle and I've had her for about 8 years. She lives in a tank of mostly water with a small spot for her to get out under a heat lamp. She does like to get under things sometimes (when she was younger I'd find her buried under the rocks) so they do like to hide sometimes but no they don't have to live in the mud.
Les Gray, the lead singer of the band Mud, is buried in St. Margaret's Churchyard in Rottingdean, East Sussex, England.