Fish at the other end of Earth ... Though not closely related, they all evolved the "tools" necessary to subsist on an ant diet: a long, sticky tongue, few teeth, a rugged stomach, and large ...

goby fish that live in burrows dug by marine shrimps, and aphids that feed on plant sap and excrete a sweet "honeydew" that ants find delicious. One common instance of symbiosis teams up microbe ...