"But how would we KNOW if the amount of bird-chirping were especially loud from one spring to the next?," she asked herself.
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There must be ornithologists with calibrated instruments. I swear I heard about this once. It seemed to also involve using Fourier transforms to match bird songs, like Shazam app for birds.
We have a mockingbird who has learned to replicate a car alarm noise, and it's not bringing him any lady birds because lady birds are not car alarms, and I'd love to shazaam him some night.
