On a walk one evening in early spring...
I saw several groups of "lights" in triangular patterns fly overhead.
If some of the lights hadn't honked, I might have wondered what I
was seeing, at least for a bit.
The UFOs turned out to be flocks of geese returning from their winter
nesting grounds flying at night, close enough to have their underbellies
illuminated by lights from the ground.
An interesting sight just the same.
I think this was the solution to the Lubbock Lights of 1951 as well.