Pattern of mammal dwarfing during global warming

An Arenahippus jaw fragment (with second and third molars), as discovered in field

[Credit: University of New Hampshire]

Comparing fossil size; larger non-ETM2 Arenahippus specimen in left hand, smaller mid-ETM2

Arenahippus specimen in right hand [Credit: University of New Hampshire]

Artist rendering of a Sifrhippus sandrae, right, with a modern Morgan horse that stands about 5 feet tall

at the shoulder and weighs about 1,000 pounds [Credit: Florida Museum of Natural History,

illustration by Danielle Byerley via AP]

Fossil-rich field location in Bighorn Basin, Wyoming

[Credit: University of New Hampshire]

TANN

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