I share your love of sounds, and creatures, first becoming aware of the importance of sound during final year 1st degree (Electrical and Electronic Engineering) project, which involved creating underwater high voltage sparks, to create acoustic shockwaves for the purpose of "acoustically cleaning" ships and other man made structures underwater. I had to learn all about barnacles, the main "culprit" marine organism which had to be cleaned. If anything it made me very aware of how special the barnacle is, and actually how special all life is, and actually it wasn't right what we were intending to use that particular development of underwater acoustics for.

This might have had more than a little to do with why we concluded it wasn't a good idea at all, confirmed by the realisation that it actually weakened, if not immediatly destroyed the metal structure; the amount of shock imparted to the structure necessary to remove the organism, was very damaging to the stucture, so best just to leave the barnacles to do their thing.

The most valuable technical lesson I learned was that Maxwells Equations more or less applied also in the world of acoustic fields.

The barnacle has a single eye, which migrates from its leading tip as a waterborne organism, to its base after it adheres to its selected substrate, and starts to secrete its shell, the eye still peeking out from under the edge of the shell, after the barnacle becomes a full adult.

They are hermaphrodite, mating sometimes across many inches, using reproductive members bridging that distance between one another when they are sparse, which is pretty impressive, it maybe holds the record for relative length of penis :)

Begs the question, doesn't the spider see through its eight eyes? Maybe some spiders don't have those?