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The Rest Is Science
The Rest Is Science

Do animals know they’re lying?

February 17, 2026 • 53m

Summary

⏱️ 6 min read

Overview

Michael Stevens and Hannah Fry explore the fascinating world of animal deception, examining whether creatures beyond humans can truly lie. They journey through various levels of deception in the animal kingdom, from basic camouflage to sophisticated behavioral manipulation, ultimately grappling with the question of whether animals possess 'theory of mind'—the ability to understand that others have different beliefs and knowledge—which is essential for genuine lying.

Levels of Deception: From Camouflage to Conscious Choice

The hosts establish a taxonomy of deception, starting with the most basic form: animals that simply look like something else. Stick insects and camouflaged creatures represent involuntary deception—they can't help their appearance. The discussion then progresses to animals that can change their deceptive appearance in response to their environment, like chameleons and cuttlefish, representing a more complex level where behavior plays a role, even if it's still largely instinctive.

  • Stick insects and butterflies with false eye spots represent the lowest level of deception—involuntary and always present
  • Camouflage animals that respond to their environment (like chameleons) represent a more complex level of deception
  • There's a key distinction between always being deceptive versus sometimes choosing deceptive behavior
" Is it pretending to be a stick? That seems to give it a lot of agency. It cannot help the fact that it is stick-shaped. That is involuntary deception. "

Strategic Deception: Cuttlefish Cross-Dressing and Penguin Prostitution

The conversation moves to more sophisticated forms of animal deception involving active behavioral choices. Male cuttlefish disguise themselves as females to sneak past dominant males and mate, while female Adélie penguins engage in elaborate deception to steal pebbles from males by feigning romantic interest. These examples demonstrate animals making strategic decisions to deceive members of their own species for reproductive or survival advantage.

  • Smaller male cuttlefish change their coloring to mimic females, fooling larger alpha males to gain mating access
  • Two out of five observed 'sneaker' male cuttlefish successfully became fathers using this deceptive strategy
  • Female Adélie penguins perform fake courtship bows to receive pebbles from males, then flee without mating
  • George Murray Levick's 1910 observations of penguin behavior were too scandalous for Edwardian society and hidden for 100 years
" There seems to be no crime too low for these penguins. "
" She steals the money, doesn't perform the service that was paid for. "

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