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Box Jellyfish vs Portuguese Man O' WarSee Who Wins

Box Jellyfish vs Portuguese Man O' War - Animal Matchup

Prepare for an electrifying encounter between two of the ocean's most venomous creatures - the Box Jellyfish and the Portuguese Man O' War! I'll be providing you with the play by play for this mesmerizing three-round battle. Get ready for an aquatic showdown!

Contender 1: Box Jellyfish

The Box Jellyfish, also known as the Sea Wasp, is a highly venomous marine animal found in the waters of the Pacific and Indian Oceans. It has a cube-shaped bell with up to 15 tentacles that can grow up to 10 feet long, each lined with thousands of stinging cells called nematocysts. Its transparent body makes it difficult to spot in the water, and its venom can cause heart failure and death in humans within minutes of contact.

Fun Fact: The Box Jellyfish has 24 eyes, grouped into four clusters called rhopalia, which can detect light, color, and movement, making it one of the few jellyfish species with a complex visual system.

The Portuguese Man O' War is a marine animal that is often mistaken for a jellyfish, but is actually a siphonophore - a colony of specialized organisms working together. It has a gas-filled bladder that allows it to float on the surface of the water, and long tentacles that can reach up to 165 feet in length. Its tentacles are covered in venomous cells called nematocysts, which can cause painful stings to humans and other animals.

Fun Fact: The Portuguese Man O' War is not a single organism, but a colony of four different types of specialized organisms called zooids, each with a specific function such as feeding, reproduction, and defense.

Matchup Stats

Box JellyfishPortuguese Man O' War
SizeUp to 10 feet (3 meters)Up to 12 inches (30 cm) tall, tentacles up to 165 feet (50 m) long
WeightUp to 4.4 pounds (2 kilograms)N/A (floats on surface)
Key StrengthVenomous tentaclesVenomous tentacles
Biggest WeaknessNot an aggressive predatorFragile body, easily damaged
see our sources
Fun Fact: Despite its deadly reputation, the Box Jellyfish is not an aggressive predator and only uses its venomous tentacles for defense or to stun prey. It feeds on small fish, shrimp, and other jellyfish, and can swim up to four knots using its pulsating bell.
Fun Fact: Despite its name, the Portuguese Man O' War is not a true jellyfish, and is actually more closely related to coral and sea anemones.
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Box Jellyfish
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Portuguese Man O' War
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Box Jellyfish vs Portuguese Man O' War

See Who Wins


Our AI fight will simulate a 3 round match between the Box Jellyfish and the Portuguese Man O' War. It considers each Animal's size, strength, and natural predatory behaviors. As in nature, each match is unique, and the outcome can vary.

Match Highlights

Box Jellyfish vs Portuguese Man O' War, Battle, Portuguese Man O' War On The Offense - Animal Matchup

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Scientific Stats

Box JellyfishPortuguese Man O' War
Scientific NameChironex fleckeriPhysalia physalis
FamilyChirodropidaePhysaliidae
HabitatMarineOpen ocean
GeographyPacific and Indian OceansFound in warm waters worldwide
DietSmall fish, shrimp, and other jellyfishSmall fish and plankton
Lifespanfew hours - few months1 day - 1 year

Key Differences between Box Jellyfish and Portuguese Man O' War

Box jellyfish are smaller, with a bell-shaped body and long, slender tentacles that have a potent venomous sting that can be fatal to humans. Portuguese Man O' War are larger, with an elongated, balloon-like shape and tentacles arranged in clusters that can extend up to 50 meters in length. They have a less potent sting that is still painful and can cause skin irritation. Box jellyfish are typically transparent or pale blue in color, while Portuguese Man O' War have a distinctive purple or blue coloration.
  1. Shape: The Box Jellyfish has a bell-shaped body, while the Portuguese Man O' War has a more elongated, balloon-like shape.
  2. Tentacles: The Box Jellyfish has long, slender tentacles that hang from the corners of its bell-shaped body, while the Portuguese Man O' War has tentacles that are arranged in clusters and can extend up to 50 meters in length.
  3. Size: The Box Jellyfish is smaller, typically measuring up to 30 centimeters in diameter, while the Portuguese Man O' War can grow up to 30 centimeters in length.
  4. Color: The Box Jellyfish is typically transparent or pale blue in color, while the Portuguese Man O' War has a distinctive purple or blue coloration.
  5. Sting: The Box Jellyfish has a potent venomous sting that can be fatal to humans, while the Portuguese Man O' War has a less potent sting that is still painful and can cause skin irritation.

Sources:nationalgeographic.combritannica.comaustralian.museum