What are we referring to here
drill and mandrill

Drill (creature) The drill (Mandrillus leucophaeus) is a primate of the family Cercopithecidae (Old World monkeys), identified with mandrills and considerably more near mandrills. It is one of two animal varieties relegated to the sort Mandrillus, alongside the drill.

Explanation:

Both the mandrill and the drill were once delegated monkeys in the sort Papio, however they presently have their very own variety, Mandrillus. Mandrills are amazingly brilliant, maybe more so than some other well-evolved creature.

They are effectively recognizable by the blue and red skin on their appearances and their brilliantly shaded rear ends. A mandrill likewise submits by showing its back end.

With hostility, mandrills will gaze, bounce their heads, and slap the ground. Vocalizations like thunders, crowings, and "two-stage snorts" are made for long separations, while "yaks", snorts, "k-alerts", "k-sounds", shouts, gurneys, and toils are made at short separations.

cockroaches and rats most likely symbolize in the play is :