How many hearts does an octopus have?
An octopus has three hearts: two pump blood through the gills and one pumps it to the rest of the body.
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- Do octopuses use tools?
“The coconut octopus carries coconut shells around and uses them as portable shelters, one of the first known examples of tool use in invertebrates.”
Reference: Current Biology (2009)
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The world's most poisonous octopus
The worlds most smallest octopus, the Blue Ring, is also the worlds most poisonous.
Do dolphins use tools?
Some bottlenose dolphins in Shark Bay, Australia, wear marine sponges on their snouts to protect them while digging for food. The habit is mostly passed from mothers to their offspring.