Meet the world’s smallest farmer – a “social amoeba” that seeds new land with bacteria, which it then eats. Just as human farmers carry seeds and livestock when they move to new areas, the amoeba can prepare for harsh conditions by bringing a ready food supply with it. It joins ants, termites and humans on the list of creatures that practice agriculture.

The amoeba, Dictyostelium discoideum, is also known as a slime mould, but scientists who work with it sometimes use the more affectionate name of Dicty. Dicty spends most of its time as a single cell, oozing through the undergrowth in search of bacteria to eat. When they run out of prey, the amoebas unite to form a many-celled