Squid were a species of cephalopod native to Earth.
The Doctor had some encounters with giant squid. (PROSE: Peacemaker, TV: The Power of Kroll)
When Fu Peng invited the Third Doctor to dinner, he told him they were having dried squid and stewed jellyfish. (TV: The Mind of Evil)
Lin thought that Kaled mutants, such as the one she encountered at a dig site beneath Sheffield Town Hall, looked like giant squids. (TV: Resolution)