cephalopod

Reader's　Digest 2月号の記事 "Dad Jokes... Ruined by Gentle Parenting" からの引用です。

How many tickles does it take to make an octopus laugh? Ten tickles!
Only as long as the octopus is fine with being tickled. Remember, we should always respect the boundaries of other people and cephalopods. How would you feel if someone tried to tickle you when you didn't like it? Not very good, right? So next time you encounter an octopus, be sure to ask before drumming your fingers along its slippery body.

駄洒落ですね。
"cephalopod" は少なくともタコを含む動物のカテゴリーを示しているようですが、辞書で確認します。

・Oxford English Dictionary: a type of mollusc with a combined head and body and large eyes. Cephalopods have arms and/or tentacles (= long thin parts like arms), which may have suckers (= round parts that enable them to stick to a surface) on them. Octopus and squid are cephalopods.
・Vocabulary.com: Ocean animals that have a head and tentacles are cephalopods. The largest-known cephalopod is the colossal squid, which lives in the deepest part of the ocean and can grow to nearly 50 feet long.
Scientists are just beginning to understand how intelligent cephalopods are, after centuries of assuming their simple nervous systems meant they were simple creatures. Octopuses are probably the smartest of this marine mollusk class, able to solve puzzles and mazes and escape from just about any container. All cephalopods have a head and either eight or ten legs; the Greek roots of the word are kephalē, "head," and pod-, "foot."

イカもこの部類に入るのですね。