This is the 6019th most frequent Polish word.
żółwie
"Żółwie" means "turtles" in English.
Here, 'żółwi' is the plural form genitive of 'żółw', indicating possession or relation in plural form.
Na plaży zauważyłem wiele żółwi.
On the beach, I noticed many turtles.
In this sentence, 'Żółwie' is used as the nominative plural form of 'żółw', functioning as the subject of the sentence.
Żółwie są bardzo wolne w poruszaniu się.
Turtles are very slow in movement.
Here, 'żółwie' is used in the plural accusative form of 'żółw', indicating the direct object of the verb 'widzę' (I see).