The Deadly Portuguese Man O' War | Blue Planet II | BBC Earth

Summary by Krater

This video examines jellyfish drifting in open oceans and details the predatory behavior of the Portuguese man o' war, including how it uses its gas-filled bladder as a sail, trails venomous tentacles up to 30 meters long, and feeds on fish.

From the video

Answers: How do jellyfish and Portuguese man o' war hunt and survive in the open ocean?

• Jellyfish ocean drifting
• Portuguese man o' war anatomy
• Marine predator hunting strategies
• Jellyfish tentacle stings

What it concludes

• Over half of all animals in the open ocean drift in currents as jellyfish.
• The Portuguese man o' war floats with the help of a gas-filled bladder topped by a vertical membrane serving as a sail.
• The Portuguese man o' war trails tentacles up to 30 meters long armed with thousands of stinging cells.
• A single tentacle of the Portuguese man o' war can kill a fish or in rare cases a human.
• A voracious Portuguese man o' war may collect over a hundred small fish in a day.