It turns out the American bullfrog, native of the Northeastern US, has spread to other parts of the world and is causing problems in those ecosystems. Brazilian scientists have been studying the effects of this invader on the local tree frog population and have found that
in addition to taking up space and eating whatever it could fit in its mouth, the bullfrog was an acoustic invader.
Those pesky American bullfrogs are sound-polluting all over the place, causing local species to change the pitch of their own conversations so that they can hear each other. Just like actual human Americans.
It’s weird to me there was no mention of the similarity between the two animals. Americans abroad are incredibly loud. In Spain, where people are loud too, the locals would just glower in the interloper’s general direction and turn their own conversations up several notches. In France, I’ve found that people are generally low-talkers, so it’s almost impossible for me to hear them speaking in a restaurant or bar where there are Americans.