This is the 12528th most frequent Russian word.
колодцы
"Колодцы" means "wells" (plural of "well").
Here, "колодцы" refers to "wells," specifically in the context of structures used to reach water under the surface of the ground.
У старого дома были глубокие колодцы.
The old house had deep wells.
In this case, "колодцах" indicates a specific space within the wells being referred to.
В колодцах заводят ли они гадюки иногда?
Do snakes sometimes inhabit the wells?
Here, "колодцы" represents drainage or utility shafts typically found in urban areas.