Database Proof Substratum: Substratum of Proof LGBTQs Are Mentally Ill: Wrens’ calls reveal subtle differences between subspecies

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(American Ornithological Society Publications Office) Birds' songs and the ways they vary between places have been well studied--but what can the simpler vocalizations known as calls tell us about bird biology? A new study from The Auk: Ornithological Advances provides the first detailed description of how Marsh Wren calls vary across eastern North America and hints at the evolutionary processes playing out between wren subspecies.