eli5: do boobs actually hold liquid milk or are they like camel humps?
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Camel humps are fat. The reason they have fat disproportionately on their backs is because fat acts as an insulator, see how some animals use it as primary insulation like seals. Think of this like a puffer jacket where the puffs are snacks. You need to carry the snacks with you hiking, but if it’s hot then wearing the jacket is going to overheat you. You can carry less snacks so you stay cooler but you don’t have as much food with you, or you can put the jacket in a backpack and carry that so you still have all your snacks. Camels went for the backpack method. Another animal that did this is fat-tailed sheep, though they store fat in their haunches instead of on their back.
Breasts are where humans store their mammary glands. All mammals have some sort of mammary tissue that produces milk, and various structures around it. Echidna don’t even have a nipple and instead appear to ‘sweat’ milk right through the skin. Others have explained mammary tissue more in depth! There are various theories as to why humans store fat around mammary tissue to form breasts, and to the best of my knowledge there’s not one clear answer.
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