Chris huh / wikicommons
The elusive dwarf sperm whale is thought to be the smallest whale that is currently known about. It is a sub-species of the sperm whale family, but, despite this, is actually smaller than some of the bigger dolphins.
Most studies of dwarf sperm whales have come from investigating dead carcasses that turn up, but from this it has been estimated that they can grow up to 2.7m in length and weigh around 250kg.
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