This is the 17914th most frequent Polish word.
łyski
"Łyski" refers to grebes, a type of water bird.
In this sentence, 'łyski' refers to thin patches of fur or bare spots.
Pamiętam, kiedy bobry nad rzeką miały łyski od trawek.
I remember when the beavers by the river had thin patches from the grass.
Here, 'łyski' refers to moorhens, a type of bird.
Łyski zapamiętam z tej wycieczki, kiedyś je opowiem dzieciom.
I will remember moorhen birds from this trip, and I will tell children about them someday.
In this usage, 'łyski' metaphorically describes bare or leafless parts of trees.