Heterotrophic nutrition refers to the process by which organisms obtain organic molecules and energy from external sources, such as other organisms or their byproducts. There are several types of heterotrophic nutrition found in living organisms. Here are some common examples:

1. Holozoic Nutrition: This is the most familiar type of heterotrophic nutrition found in animals, including humans. Organisms ingest solid or liquid food and digest it internally. The food is broken down into simpler substances by mechanical and enzymatic processes, and the nutrients are absorbed into the body for energy and growth.
2. Saprophytic Nutrition: Saprophytic organisms obtain nutrients by decomposing dead organic matter. These organisms, such as fungi and certain bacteria, secrete enzymes onto the dead organic material and absorb the resulting simpler molecules. They play a crucial role in the decomposition and recycling of organic matter in ecosystems.
3. Parasitic Nutrition: Parasitic organisms obtain their nutrients from living hosts. They live in or on the host organism and derive nourishment by feeding on its tissues, fluids, or cells. Examples of parasites include fleas, ticks, lice, and various internal parasites that infect animals and humans.
4. Symbiotic Nutrition: Symbiotic organisms live in close association with another organism, where both partners benefit. There are different types of symbiotic relationships, such as mutualism (both partners benefit), commensalism (one partner benefits while the other is unaffected), and parasitism (one partner benefits at the expense of the other).
5. Fluid-Feeding Nutrition: Some organisms, like certain insects and birds, feed on the fluid content of plants or animals. They have specialized mouthparts that allow them to extract and consume the fluids, such as nectar, sap, or blood. Examples include butterflies feeding on nectar, mosquitoes feeding on blood, and hummingbirds feeding on flower nectar.

These are just a few examples of the various types of heterotrophic nutrition found in nature. Different organisms have evolved different strategies to obtain their required nutrients from external sources, depending on their ecological niche, adaptations, and available food sources.