Squids are wildlife native to Epsilon Thalassus, who appear only in specific waves in Cluck of the Dark Side. They are likely hostile, as they (or rather, their tentacles) emerge from the ground, trying to kill you.
They are purple tentacles with green spots on them. It is unknown how the Squids truly look like, as only the tentacles are ever visible.
Editions don't change them at all.
Squids appear in three waves - Wave 34, 36, and 39. When they emerge, the screen shakes. In Wave 34, only one is present. In Wave 36, there are four Squids present. They emerge one by one. In Wave 38, there are eight present. They all emerge at once. In all waves, they have 50000 health, matching the health of the Big Chicken from Revenge of the Yolk's Prologue. They also give 50000 points in all waves they appear in, so killing them is very profitable.