---
title: "American Cockroach vs Immortal Jellyfish: Who Would Win?"
description: "Who would win, American Cockroach or Immortal Jellyfish? Too close to call: our 3-round simulation gives 51% to 49%."
image: "https://animaltracks.wiki/icon-512.png"
---

# American Cockroach vs Immortal Jellyfish: Who Would Win?

American Cockroach vs Immortal Jellyfish is too close to call. Our 3-round simulation gives American Cockroach a 51% chance and Immortal Jellyfish 49%, which is not enough for either to claim the win.

The simulation puts both animals on neutral ground. In the wild, terrain, the size of the individual animals and plain luck would all change the result.

## Verdict: Too close to call
- **Win probability**: American Cockroach 51%, Immortal Jellyfish 49%
- **Decisive weapon**: Evenly Matched Evolutionary Countermeasures

### Round 1: Opening Clash & Speed

American Cockroach seizes the opening initiative with superior agility (35 vs 39), circling Immortal Jellyfish and striking from an advantageous flank.

### Round 2: Clash of Superpowers

An earth-shattering clash as American Cockroach's "Switches from six-legged to four-legged and two-legged running at up to 50 body lengths per second" crashes directly into Immortal Jellyfish's "Life cycle reversal: a damaged, starved or aging medusa becomes a cyst, then a polyp", sending shockwaves through the arena.

### Round 3: Final Resolution

After three grueling rounds, neither creature can establish a decisive edge. Both combatants retreat to neutral ground with full mutual respect.

## Fighter 1: American Cockroach (*Periplaneta americana*)
- **Superpower**: Switches from six-legged to four-legged and two-legged running at up to 50 body lengths per second
- **Danger Level**: Low
- **Conservation Status**: Not Evaluated
- **Habitat**: Mainly basements, sewers, steam tunnels and drainage systems, worldwide
- **Musical Match**: Hella (Math Rock & Instrumental Virtuoso)
- **Full Dossier**: [Read American Cockroach Profile](https://animaltracks.wiki/animals/american-cockroach/)

## Fighter 2: Immortal Jellyfish (*Turritopsis dohrnii*)
- **Superpower**: Life cycle reversal: a damaged, starved or aging medusa becomes a cyst, then a polyp
- **Danger Level**: Low
- **Conservation Status**: Not Evaluated
- **Habitat**: Rocks, docks and hulls as a polyp, open water as a medusa: the Western Mediterranean and Adriatic, plus introduced populations in Florida, Panama and Japan
- **Musical Match**: M83 (Dream Pop & Shoegaze)
- **Full Dossier**: [Read Immortal Jellyfish Profile](https://animaltracks.wiki/animals/immortal-jellyfish/)

## Biological Matchup Context
When contrasting American Cockroach against Immortal Jellyfish, tactical victory depends on physiological engagement range, strike speed, armor density, and chemical or physical defense mechanisms:
- **American Cockroach**: A cockroach that switches to running on four legs, and on two, at up to 50 body lengths per second.
- **Immortal Jellyfish**: A bell up to 3.3 millimetres wide that can turn back into a polyp instead of dying, in the lab at least.

Pick your own matchup in the interactive arena: [Battle Arena](https://animaltracks.wiki/compare/american-cockroach-vs-immortal-jellyfish/)

> The Battle Arena is an algorithmic thought experiment for education and entertainment. Never provoke, fight, or disturb animals in the wild.

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