I thought the reverse at some point until I realized that a couple of woodpeckers were making sounds similar to squirrels. I was laying in my tent one morning and heard those calls and thought some squirrels were "fighting", but then they started pecking at a tree so I realized what they were.
Also, the first time I went in the Caribbean I thought birds were making such a ruckus in the evening but it was actually a small frog called Eleutherodactylus martinicensis.
Possible. However as a non native English speaker myself, I kind of take pride in making sure I'm understood, and grammatically cromulent.
And i've seen multiple people apologizing for their English, then having a better vocabulary and grammar than most native speakers.
Of course some people can barely make a sentence in a second or third language. It's quite possible. I'm really bad at making coherent sentences in German, even after many years of studying it. But in my experience, non native speakers tend to be careful about this.