premise: The other day I let Pie out of his cage and he naturally migrated to the budgie cage which was sitting near the window . Pie loves the window and the window sill so he started hopping around the sill and climbing the bars of the budgie cage . We have alot of minor birds in our suburb and the sight of an uncaged bird hopping around attracted them all to the window . Why did the writer let Pie out of his cage ?
hypothesis: Because he migrated to the budgie cage .