Global Warming Could Give Rise to Miniature Animals

mini horse photo
CC BY 2.0. Phil Konstantin

Phil Konstantin/CC BY 2.0

Climate scientists have painted a pretty grim outlook for our planet in the wake of an unabated release of greenhouse gases into the atmosphere -- from rising sea levels and increasing weather disasters, to resource shortages and mass extinctions -- but there's one side effect of global warming sure to make you go 'aww'. According to paleontologists, an early species of horse was discovered to have responded to an extended bout of unusually hot temperatures million years ago in the most peculiar of ways: by going miniature. And given the steamy future which may be in store, it could happen again -- this time, to your quite-possibly-mini great-great-grandkids.

For 175 thousand years, due to a rise in global temperatures 58 million years ago known as the Paleocene-Eocene Thermal Maximum, one of the first equestrian species to gallop the planet underwent a dramatic change in size. During this period, a higher than normal levels of atmospheric carbon dioxide lead to hotter planet, and in response fossil evidence of shows that an early ancestor of the horse, Sifrhippus, shrunk to the size of a house cat. Other species, say researchers, even halved in size to accomodate the hot spell.

The world's smallest horse, roughly the size of the ancient Sifrhippus.

While the findings might be noteworthy in the field of paleontology alone, the research team behind a study on the shrinkage believes it has implications for Earth's future as well.

"Now we're seeing the same degree of warming happen possibly over a century or two," says Ross Secord, and assistant professor of Earth and atmospheric sciences at the University of Nebraska-Lincoln.

Looking forward, climate researchers have already predicted a rise in global temperatures to occur over the course of centuries, not the relatively gradual warming which occurred over thousands of years in the case Paleocene-Eocene Thermal Maximum. So, the question remains whether species alive today will be able to adapt rapidly enough, quite possibly by shrinking, as did their prehistoric ancestors.

“It’s difficult to say that mammals are going to respond in the same way now,“ says Dr. Secord, via the New York Times. “If I had to guess, I would say they will."