I don't have another tiny animal to mention, but here's something obscure!
You won't find it often in music but there's an audio-based illusion that exists called the Shepherd Tone. It's basically a constant rising or descending pitch of a single note, though the effect can be achieved through a chord and/or a series of notes as well.
How it works, for those curious enough to ruin the illusion
It works through two layers where one can disguise the fading in and out of the low and high notes in a loop. However, it works better with an additional third layer that masks the transition even more on both ends. If you're willing to pay attention, you can start to find the beginning and the end of the loop of most instances of it being used. The second example below makes the loop much easier to hear and underatand since it seperates the layers by panning them on the left and right.
I'd argue the most famous example of it is in a Mario game and it sounds like anxiety bc of the eerie chords behind it.
My favorite example of it is here in a more band-focused setting. La Dispute's "Fulton Street I" features the illusion by having a guitar play a series of notes constantly going up the neck. The moment's at around 4:19 if you wanna skip there.