There is DMT in all living things, including plants, but only certain animals can actually synthesis it within their bodies, such as the Bufo alvarius. in my own personal opinion I call this the conscious chemical because it makes you very aware of your surroundings. Certain drugs like Iowaska is derived from a tree's root in the Amazon. This is why I believe plants have levels of communication between one another and, as crazy as it sounds, have some level of consciousness.
Drugs have always amazed me, but DMT is by far the most intricate and interesting.