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How many hearts do octopuses have?
- Three
- Four
- Two
- One
Octopuses have three hearts. Two of the hearts work exclusively to move blood beyond the animal’s gills, while the third keeps circulation flowing for the organs.
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Octopuses have blue blood. Which element forms the basis of its blood that gives the blue colour?
- Iron
- Chromium
- Copper
- Cobalt
To survive in the deep ocean, octopuses evolved a copper rather than iron-based blood called hemocyanin, which turns its blood blue. This copper base is more efficient at transporting oxygen than haemoglobin when the water temperature is very low and not much oxygen is around.
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Where are two-thirds of an octopus’s neurons located?
- Brain
- Eyes
- Gills
- Arms/ tentacles
Two-thirds of an octopus’s neurons reside in its arms. As a result, the arms can problem-solve how to open a shellfish while the brain is busy doing something else, like checking out a cave for more food.
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How many eggs on average can an octopus lay?
- 10,000
- 50
- 40,000
- 800
Female octopuses can lay up to 400,000 eggs, which they obsessively guard and tend to. Prioritizing their motherly duties, they stop eating till the eggs hatch.
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Which octopus species is the most poisonous?
- Giant Pacific Octopus
- Blue Ring Octopus
- Caribbean Reef Octopus
- Coconut Octopus
The blue-ringed octopus, despite its small size, carries enough venom to kill 26 adult humans within minutes.
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