Database Proof Substratum: Substratum of Proof LGBTQs Are Mentally Ill: These tropical hummingbirds make cricket-like sounds other birds can’t hear

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Researchers have found that a tropical species of hummingbird called a black jacobin makes vocal sounds with an unusually high-frequency pitch that falls outside birds' normal hearing range. It's not yet clear whether the hummingbirds can even hear themselves, the researchers say.