I have a Buckeye tree in front yard. I've been told by an aging neighbor (who wears dark blue suspenders and shuffles about) that the tree was planted in 1897, before the house was even built.
It was hurt by a late freeze in the Spring, and therefore, lost all of its leaves this summer while
producing the Buckeye nuts. (The Walnut & Oak trees didn't even bother to put out fruit)
It is skeletal now. And the squirrels sit atop branches. Cracking those nuts. Letting the shells fall to the ground. Scattering along the sidewalks and lawn. And the neighbor cats just perch in the grass. Watching the squirrels.
Sometimes, a shell or two, end up on my porch stoop. I think they must land there, after falling from the treetop & bouncing up from the sidewalk.