"Ludzie mają zwierzęta."

Translation: People have animals.

[TARDISToni]

Ludzie mają zwierzęta ... ale koty mają ludzi.

[Tainan712593]

I didn't understand why the ending is "zwierzęta". Could someone help me please?

[alik1989]

Neuter nouns with the nominative ending -ę are quite rare and undergo irregular declension:

https://en.wiktionary.org/wiki/-%C4%99#Declension