Quiz: Octopus

Bulletin of 12 March 2026

How many hearts does an octopus have?
Answer
Three hearts.
What colour blood does an octopus have? (bonus point for why)
Answer
Blue. It contains copper-based hemocyanin.
What type of animal group do octopuses belong to? a) Fish, b) Crustaceans, c) Molluscs, d) Amphibians.
Answer
c) Molluscs.
True or False: An octopus can regrow a lost arm.
Answer
True. (often within 100 to 130 days).
What specialized skin cells allow octopuses to rapidly change colour?
Answer
Chromatophores.

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