Nesting geese will roll softballs (placed next to their nests by biologists)into their nests, perhaps because the balls resemble eggs that might have rolled out of the nest. This behavior is most likely:

Question

Quizplus · Accepted Answer

The behavior of nesting geese rolling softballs into their nests is likely innate, as it is a natural instinct for birds to gather and protect their eggs. It does not require any learning or conditioning to occur, and is simply a part of the geese's natural reproductive behaviors.

Nesting Geese Will Roll Softballs (Placed Next to Their Nests