When people think of whales, they often picture killer whales (technically dolphins), blue whales or humpback whales. Let’s face it – all whales are incredible, but in my opinion, sperm whales are some of the most unique and majestic mammals that roam our Ocean. They sleep vertically Firstly, they sleep by ‘standing’ together in their [&]

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https://www.national-aquarium.co.uk/blog/sperm-whales/