Imagine you have a foot that secretes acid, which you use to dissolve away solid rock to make a burrow. Now imagine some scientists want to prove you do this. They put some pH-sensing foil under you and really hope you'll cooperate and leave your footprint on it. You chuckle and do so, leaving a funny smooch-shaped impression on the foil. This is how it was proven that the boring giant clam uses acid to make its burrow, decreasing local pH by ~2 units! #clamFacts
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source study available here, one of my all-time faves https://royalsocietypublishing.org/doi/10.1098/rsbl.2018.0047
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