"Zannen na Ikimono Jiten" is a short-form anime series that humorously explores the peculiarities and quirks of various animals, presenting them in a mock-encyclopedic format. Each episode focuses on a specific creature, blending factual information with absurd, exaggerated traits to create comedic scenarios. The narrative structure is episodic, with no overarching plot, allowing each segment to stand independently while maintaining a consistent tone of lighthearted satire.

The main characters are anthropomorphic representations of the animals being discussed, often engaging in exaggerated behaviors that highlight their real-world characteristics in a humorous way. For example, a sloth might be portrayed as comically slow to the point of absurdity, or a chameleon might struggle with its ability to blend in, leading to awkward social situations. These anthropomorphic characters serve as both narrators and participants in their own stories, breaking the fourth wall to directly address the audience and provide commentary on their "flaws" or "regrettable" traits.

The humor derives from the contrast between the animals' real-world behaviors and the exaggerated, often ridiculous scenarios they find themselves in. The series uses this format to poke fun at both the animals and human tendencies to anthropomorphize nature, creating a playful yet informative viewing experience. Despite its comedic tone, the series occasionally incorporates genuine facts about the animals, adding an educational layer to its entertainment value.

The animation style is simple and straightforward, emphasizing the comedic timing and exaggerated expressions of the characters. The pacing is brisk, with each episode lasting only a few minutes, making it an easily digestible series that appeals to a wide audience. The lack of a continuous narrative allows viewers to jump in at any point without needing prior context, further enhancing its accessibility.

Overall, "Zannen na Ikimono Jiten" offers a unique blend of comedy and education, using its mock-encyclopedic format to deliver quick, entertaining insights into the animal kingdom. Its episodic structure and humorous approach make it a distinctive entry in the realm of short-form anime.