mice = myszy

Inside the industry supplying millions of mutant mice | New Scientist

Source: https://www.newscientist.com/article/dn23874-inside-the-industry-supplying-millions-of-mutant-mice/

myszy

English sentence and Polish translation

Don't tell me a big guy like you is scared of mice. = Nie mów mi, że taki duży facet jak ty boi się myszy.