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Yet Another Mammal Is Shrinking Thanks to Climate Change

Global warming has made Alpine mountain goats 25 percent smaller.
An Alpnie Chamois Goat. Image: Doronenko / Wikimedia

For at least the third time, we're witnessing species of mammals growing smaller in response to climate change. The same thing the fossil record shows happened to the Diacodexis is happening to its descendants, the ungulates, today. Alpine Chamois mountain goats, in other words, are shrinking.

Since the 1980s, the Alps have grown warmer by 3-4 degrees Celsius. This warming has already had one of the strangest effects of climate change observed thus far: thawing out corpses from a battle that happened back in World War I. The shrinking goats, in spite of how that sounds, aren't nearly as unprecedented.

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"Body size declines attributed to climate change are widespread in the animal kingdom, with many fish, bird and mammal species getting smaller," the study's lead author Tom Mason, said in a statement.

The Durham University researchers tracked Chamois populations in three different hunting districts, and also consulted hunting records, and found that much like our cell phones, young Chamois now weigh a quarter less than the Chamois of the 1980s. The smaller Chamois appeared across sexes and across sites.

While researchers are not totally sure why, they have theories for how the warmer weather may be responsible. They considered whether warmer weather was reducing the availability of nutritious spring plants, or was otherwise affecting the availability of food in the (presumably picturesque) Alpine meadows where the wild goats do play. But that didn't seem to be a problem.

The population was growing in numbers, somewhat, in response to a longer growing season, which leads to more competition and has in the past resulted in shrinking mammals.

But the study states that goats are known to rest when it's very warm. Perhaps juvenile goats are spending less time foraging and more time resting in the shade, the researchers speculate.

It's a problem for the goats, because they need some energy reserves stored up for the lean winter months, and no goat needs that more than a young goat.

Lonely goatherds, who presumably are now primed to grow even lonelier, released this statement in response: