Mammals, reptiles, amphibians, what else? Mollusks. Do Mollusks count? It has been argued that because a mollusk (such as a Quahog which is also a bivalve) has limited sensory apparati it makes it less of a species. Ok.
Well, what if they way in which quahogs pick up on things is actually something else. Those little "eyes" that they have that signal "clamming up"- further analysis -