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Why does poop, urine, sweat, etc. smell bad?

Sarah Jenkins
Sarah Jenkins
Lead Content Curator · Jan 29, 2026 · Updated Apr 13, 2026

Many animals have evolved to not like the smell of poop because poop is not nutritious and is full of bacteria. The animals who didn't think poop smelled bad probably died from the bacteria. The animals who developed by mutation receptors in their noses that recognized toxins in poop avoided the …

67
Words

1 min
Read Time

#226
of 500 in Human Body

-3%
vs Category Avg

The Short Answer

Many animals have evolved to not like the smell of poop because poop is not nutritious and is full of bacteria. The animals who didn't think poop smelled bad probably died from the bacteria. The animals who developed by mutation receptors in their noses that recognized toxins in poop avoided the poop and lived. These animals had more offspring and thereby passed these receptors onto their offspring.

Analysis

Key Concepts: Poop, animals, bacteria

This explanation focuses on poop, animals, bacteria and spans 67 words across 4 sentences. The depth is typical for Human Body questions (category average: 69 words), striking a balance between accessibility and completeness.

What This Answer Covers

The explanation opens with: “Many animals have evolved to not like the smell of poop because poop is not nutritious and is full of bacteria.” It then elaborates by explaining the root cause, ultimately building toward a complete picture across 4 connected points.

How This Compares in Human Body

Ranked #226 of 500 Human Body questions by answer depth (top 46%). This falls in the detailed tier — above average depth. The explanation goes beyond surface-level but keeps things accessible.

Frequently Asked Questions

Is there a simple explanation for why poop, urine, sweat, etc. smell bad?

Many animals have evolved to not like the smell of poop because poop is not nutritious and is full of bacteria. The animals who didn't think poop smelled bad probably died from the bacteria. The animals who developed by mutation receptors in their…

How detailed is this explanation compared to similar Human Body questions?

This is an above-average answer at 67 words, ranked #226 of 500 Human Body questions by depth. The key concepts covered are poop, animals, bacteria.

What approach does this answer take to explain poop, urine, sweat, etc. smell bad?

The explanation uses root cause analysis across 67 words. It is categorized under Human Body and addresses the question through 1 analytical lens.