An organism that feeds off of other organisms is called a heterotroph.

Here's why:

* Hetero means "other"

* Troph means "nourishment"

So, a heterotroph literally means "other nourishment", which describes an organism that obtains its nourishment by consuming other organisms.

Here are some examples of heterotrophs:

* Animals: They eat plants or other animals.

* Fungi: They decompose dead organisms.

* Bacteria: Some bacteria are decomposers, while others are parasites that live on or in other organisms.

Let me know if you have any other questions!