An octopus has three hearts, blue blood, and most of its brain cells in its arms. None of that is random. This animated explainer follows the blood, one metal at a time, and shows how every strange octopus feature solves another.

Chapters:

0:00 Intro

0:21 What is an octopus?

1:15 Blue blood: iron vs copper

2:23 The copper problem

3:19 Three hearts

4:27 The heart that stops

5:30 The vanishing act

6:36 Colour-blind artists

7:28 Brains in its arms

8:38 A fast life, and the answer

• Clear English AI voiceover with a fast, tight pace

• Original synthesized music and sound effects, mixed to -14 LUFS

• Original flat vector animation in a neon, Kurzgesagt-inspired style

• Fact-checked: hemocyanin, gill hearts, the pausing systemic heart, chromatophores, the mimic octopus and the 53-month brooding record

A family-friendly science story about one of the strangest animals in the ocean.