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Last updated: April 8, 2026

Quick Answer: The XKCD comic "Can You Lick It?" (comic 1105) humorously explores the anatomical limitations of humans and animals in their ability to lick certain parts of their own bodies. It highlights the physical constraints that prevent most beings from reaching their elbows, a seemingly simple action that is surprisingly difficult for many species.

Key Facts

The XKCD comic "Can You Lick It?" (comic 1105) is the primary reference.
The comic humorously investigates the physical impossibility for many beings to lick their own elbows.
It illustrates anatomical differences that prevent such actions, even in animals known for flexibility.
The comic serves as a lighthearted exploration of biological limitations and common human curiosities.
It references the idea that some animals, though flexible, still cannot achieve this feat due to their bone structure and limb length.

Overview

The XKCD comic titled "Can You Lick It?" (published as comic 1105) is a quintessential example of Randall Munroe's ability to take a simple, everyday question and delve into its surprisingly complex biological and anatomical underpinnings. The comic presents a series of animals and humans attempting to lick their own elbows, a feat that is, for the vast majority, physically impossible. It taps into a common childhood curiosity, a question that many have likely pondered in their own lives, and uses it as a springboard for a humorous yet informative look at the constraints of anatomy.

This particular comic strips away pretense and focuses on a direct, observable challenge. It doesn't rely on elaborate narratives or complex scientific jargon, but rather on the relatable act of trying to bend one's body in an unnatural way. By juxtaposing the efforts of various creatures, the comic underscores the universal nature of these physical limitations, while also subtly highlighting the diversity of animal anatomy and its implications for their capabilities.

How It Works

The Elbow Reach Dilemma: The central premise of the comic revolves around the anatomical impossibility for most beings to lick their own elbows. This is due to a combination of factors, including the relative lengths of the humerus, radius, and ulna (the bones in the arm), the articulation of the elbow joint, and the typical length and flexibility of the tongue. For humans, the distance between the mouth and the elbow is simply too great for the arm to contort sufficiently.
Animal Anatomy Variations: While humans are a primary subject, the comic extends this inquiry to various animals. It playfully suggests that even animals renowned for their flexibility, such as snakes or certain primates, might still struggle with this specific task. The comic implies that while some might come closer, their skeletal structure and limb proportions ultimately prevent a successful lick.
The Tongue's Role: The length and dexterity of the tongue also play a crucial role. While some animals have exceptionally long tongues (like anteaters or chameleons), their ability to reach their elbows is still governed by the mechanics of their limbs and torso. A long tongue alone is not enough if the arm cannot be positioned correctly.
Evolutionary Perspective (Implied): Though not explicitly stated, the comic implicitly touches upon evolutionary adaptations. The ability to lick one's elbow has no apparent evolutionary advantage for survival or reproduction, hence there has been no selective pressure for organisms to develop this capability. It remains a curious quirk of anatomy rather than a functional necessity.

Key Comparisons

Feature	Human	Giraffe
Elbow-to-Mouth Distance	Significant	Extremely Significant
Arm/Leg Length Ratio	Proportional	Disproportionate (Long Neck/Legs)
Tongue Length (Relative)	Moderate	Long and Prehensile
Ability to Lick Elbow	No	No
Overall Flexibility	Moderate	Moderate (Body)

Why It Matters

Relatability and Curiosity: The comic taps into a universal human experience of questioning physical limits. It's a simple yet profound observation that resonates with people of all ages, sparking a moment of self-reflection and perhaps even a few awkward attempts to test the hypothesis. This shared curiosity fosters a sense of connection.
Illustrating Biological Constraints: Beyond the humor, the comic serves as a lighthearted educational tool, subtly illustrating the fundamental constraints imposed by biology and anatomy. It shows how seemingly simple actions are governed by complex physiological structures and limitations.
Appreciating Diversity in Nature: By considering different animals, the comic encourages an appreciation for the vast diversity of biological forms and functions on Earth. Each creature is uniquely adapted to its environment and lifestyle, and these adaptations, or lack thereof, dictate what it can and cannot do.

In conclusion, XKCD's "Can You Lick It?" is more than just a gag about anatomy; it's a clever commentary on the physical boundaries that shape life on our planet. It uses a simple question to prompt thought about the intricate designs of our bodies and those of other creatures, reminding us that even the most basic actions are a product of complex biological engineering. The humor arises from the shared human experience of these limitations, and the comic leaves the reader with a slightly deeper, albeit whimsical, understanding of the natural world.