A squid or an octopus.
A better answer for this question would be:
They are an invertebrate in the phylum Mollusca meaning "soft bodied" (Mollusks). The class Cephalopoda means "head foot", meaning...
it has been reported that use of the antihelminthic drugs pyrantel and piperazine together lowers the efficiency of pyrantel. Similarly, combining a given antihelminthic drug with another medication...