An Aphid in AntWar.io is a bug that produces Honeydew. Aphids are insects, but they cannot attack or be killed in AntWar.io. An Aphid appears to be a peach - colored bug. Aphids will always try to head towards a clover Overground after enough time has passed, which can be used to find the nearest clover of some point.
Aphids do not have a very specialized AI; the only time they will ever do anything that resembles AI is when they move towards a Clover if they don't have one. Aphids cannot be killed by ants, and cannot produce Honeydew if not attached to a Clover. Aphids cannot be claimed, but they can be picked up and moved toward another Clover by an ant.