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  Have a Happy Thought: A fun fact you all learned at some point in your life is that SCUBA is an acronym – meaning it is a word made up of the first letters (or sounds) of other words. Can you remember what it means? Self-Contained Underwater Breathing Apparatus. And we humans think we are so smart for coming up with this concept. Turns out, some other air-breathing animals also take pockets of air with them when they go underwater. (as in: not just holding their breath) 1.     Diving-bell spiders (Argyroneta aquatica). These live in freshwater across the Eurasian continent, and take air with them so they can live out most of their lives underwater – they even hunt and breed underwater! But since they still need to breathe air, they spin a silk canopy and trap air bubbles that naturally form along their body hairs under the canopy. And when they need to venture out to hunt, they basically create a smaller air bubble and carry it around like a backpack. ...