What are Methanogens? Name the animals they are present in and the role they play there.

Explanation

**Step-by-Step Solution:**

1. **Definition of Methanogens**: Methanogens are a group of microorganisms that produce methane as a metabolic byproduct in anoxic (lack of oxygen) conditions. They are a type of archaea, which are distinct from bacteria.

2. **Habitat of Methanogens**: Methanogens thrive in environments where oxygen is absent. They are commonly found in the digestive tracts of certain animals, particularly herbivores.

3. **Animals Containing Methanogens**: One of the primary animals that harbor methanogens is the cow. These microorganisms reside in the rumen, which is the first stomach compartment of ruminant animals.

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