That mirrored gazing ball in your garden might have a bird wearing itself ragged against an enemy that doesn't exist.
Male cardinals, robins, mockingbirds, and towhees defend their territory hard, wired to drive off any rival male they see. A reflective ornament hands them one that never backs down.
The bird sees itself in the curved glass, reads it as an intruder sitting in the middle of its nesting territory, and attacks. It can go for hours a day, for weeks, right when it should be feeding a mate and raising chicks. All of it burns energy the family needs, against a rival that never leaves.
Smaller birds can also collide with the sky reflected on a large mirrored surface, the same way they hit windows.
You don't have to toss it. Move it where birds don't patrol, tuck it low in dense foliage so it doesn't read as open sky, or bring it in through the spring breeding season and set it back out after.
The bird thinks it's protecting its family. It's exhausting itself against a threat that's only ever its own reflection.