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There are some rare places where a whole animal can be preserved.An animal that dies in a cold place, like the tundra, can be frozen.The two fossil categories can be broken down further.A cast fossil is a fossil made when an organism that is buried in sediment decays and leave behind a mold, or hollow impression in its shape.Some organic material, like tree trunks, can be petrified.
A bog is a type of wetland where a large amount of dead plant matter accumulates.
A cast fossil is like a mold fossil, but in the case of a cast fossil the mold has been filled with minerals.
Imprint fossils are made when organic - or living - material is pressed into sediment, but does not decay like with a cast or mold, and the organic material leaves an impression in the formed rock.
After that, depending on where the animal dies, the process of fossilization can occur in different ways.
For most fossils there are three basic things that are needed: sediment, pressure, and time.