Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The cat brain weighs about 30g.
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15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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Dogs have been man's pet for over 14,000 years.
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Bats sleep 18-20 hours per day.
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