Nutritional Benefits of Female Caribou Antlers Revealed

A recent study conducted by researchers at the University of Cincinnati has uncovered a significant nutritional role of female caribou antlers. The study, published in the journal *Ecology and Evolution*, indicates that female caribou, particularly those that have recently given birth, gnaw on shed antlers as a vital source of minerals. This behavior was observed in the Arctic National Wildlife Refuge in northeastern Alaska, where over 80 percent of the 1,500 antlers examined showed bite marks, suggesting that these animals utilize the antlers as a postbirthing supplement.

Scientific AmericanWhy Do Female Caribou Have Antlers?

Caribou, known for their extensive migrations—often covering up to 1,500 miles—face significant nutritional challenges during the calving season. Female caribou shed their antlers just days before giving birth, and the study's authors, Joshua Miller and Madison Gaetano, propose that this timing allows mothers to consume the antlers for essential nutrients like protein, calcium, and phosphorus. Gaetano noted that this resource is efficiently consumed compared to other forage options available to the mothers while nursing their calves.

Scientific AmericanWhy Do Female Caribou Have Antlers?

While the study highlights the nutritional benefits of antlers, it also opens up discussions about their evolutionary significance. Other theories suggest that female caribou may grow antlers to mimic young males, thereby reducing aggression from older males, or to defend against predators. Danielle Fraser, a paleoecologist at the Canadian Museum of Nature, emphasized that the nutritional use of antlers could be one of several evolutionary roles they play.

Scientific AmericanWhy Do Female Caribou Have Antlers?

The longevity of shed antlers in the Arctic landscape—remaining for decades or even centuries—provides valuable ecological insights. The condition and location of these antlers can inform scientists about herd dynamics and contribute to conservation efforts aimed at bolstering caribou populations. Miller pointed out that understanding how these bones are recycled back into the environment can aid in managing caribou herds effectively.

Scientific AmericanWhy Do Female Caribou Have Antlers?

While the findings present a compelling case for the nutritional role of antlers, some researchers argue that the evolutionary advantages of antlers may not be solely limited to nutrition. The multifaceted roles of antlers in caribou behavior and ecology warrant further investigation to fully understand their significance.

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• “It’s a mineral that’s available to you at the time that you need it, and it presented as a very efficiently consumed resource, relative to forage,” — Madison Gaetano, Conservation Paleobiologist

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• “It can evolve to play multiple roles.” — Danielle Fraser, Paleoecologist

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• “It’s so interesting to me just how creative animals will be in meeting their nutritional needs,” — Madison Gaetano, Conservation Paleobiologist

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The study sheds light on the complex relationship between female caribou and their antlers, revealing that these structures serve not only as physical attributes but also as critical nutritional resources during a demanding period of their life cycle.

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