5 Examples of decomposer are:
Bacteria are one of the most important decomposers in the wild. They are responsible for the decomposition of organic matter in soil and water. They also play an important role in the decomposition of organic matter in the digestive tract of animals and humans. More information about the Mona Kingdom, to which the bacteria belong, can be seen in this link.
Mushrooms have a leading role in the decomposition of wood and other plant materials. They are able to degrade cellulose and lignin, which are majority components of wood and other plant materials. Here you can read about the Fungi Kingdom: features and classification and here about the Types and classification of mushrooms.
The worms are common decomposers on the ground. Some types of worms, such as earthworms, are particularly important in the breakdown of organic matter in the soil. In this other post you can read about The worms and get to know these animals better.
In this case, we refer mainly to the larval stages of insects. These are animals that often fulfill the function of decomposers of organic matter, both animal and vegetable, living in soils, organic matter in decomposing and feces. There are also examples of decomposing insects in their adult stage, such as many species of beetles.