mobilize
Explanation
The Joke
A human speaker stands at a podium addressing an audience, making a grand declaration about human uniqueness: that unlike other animals, humans have complex language, can pass information across generations, and build complex cultural institutions including religion, statecraft, and warfare. In the audience, unnoticed, sits a pigeon (or possibly a dinosaur/bird), who turns to another and whispers: "Fools." The final panel shows the birds privately agreeing: "The conquest shall be swift."
The comic subverts the common trope of humans proudly declaring their superiority over the animal kingdom. While the speaker is busy congratulating humanity on its unique capabilities, the very creatures being dismissed are shown to be not only intelligent but actively plotting an organized takeover. The birds' confidence that "the conquest shall be swift" implies they have their own complex society, strategy, and communication -- the very things the human speaker claims are exclusive to humanity.
The Humor
The humor comes from the dramatic irony: the audience is oblivious to the threat sitting among them. The speaker's confident enumeration of human advantages (language, culture, warfare) becomes unintentionally comedic when contrasted with birds who apparently possess all these capabilities and more -- and are using them to plan an invasion. The word "Fools" delivered as a quiet aside perfectly captures the trope of an underestimated villain watching the hero monologue. The comic plays on the long-running internet joke about birds being secretly sinister or even government surveillance drones, as well as the broader comedic tradition of animals being far more capable than humans realize.