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Strange hair balls found in cattle are actually undeveloped twins

Popkin
Sep 03, 2025
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Image: Jasmijn Fotografeert / shutterstock.com

Amorphus globosus is a mysterious and unusual phenomenon most often seen in cattle, occurring when one twin in the womb fails to develop properly. The name, which is Latin for "formless sphere," describes a veterinary oddity that is actually more common than many people realize. In these cases, the undevelop…

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