果冻影院

Reindeers鈥� noses may not glow red, but these creatures of cold climes have evolved the ability to change the color of their eyes to help them thrive in dark, northern winters. In this Discovery episode, we speak with Glen Jeffery, a professor of neuroscience at the Institute of Opthamology at 果冻影院 (果冻影院) in the U.K. about what makes reindeer eyes truly unique in the animal kingdom.

Most people have seen the gold, glowing eyes of a cat, a raccoon or some other nocturnal animal staring back at them during a nighttime drive. The part of the eye that produces that golden reflection, as Jeffery explains, 鈥渋s a mirror that lots of animals have called the tapetum lucidum.鈥� A taptetum helps animals see better in the dark by bouncing light from the back of the eye through the retina a second time. In most mammals, the tapetum is a 鈥渟tandard golden,鈥� as Jeffery describes the color, and that color doesn鈥檛 change.

One day, Jeffery received a box in the mail out of the blue. It contained two jars filled with reindeer eyes from a slaughterhouse in Norway. One jar was labeled summer and one was labeled winter.

鈥淚 opened up the summer ones first and I thought, 鈥業鈥檓 wasting my time here,鈥欌�� says Jeffery. He saw golden eyes, just what he expected.

鈥淏ut then we opened up the other eyes, and that was when there was a shock, because the winter eyes were blue,鈥� he said. 鈥淚鈥檇 never seen anything like that in my life.鈥�

Jeffery and his colleagues spent years studying the biology of reindeer eyes and the environment they are made for 鈥� the dim, blue-hued months of the Arctic winter. What they discovered is a marvelous bit of evolution that has given reindeer some of the most interesting eyes on Earth. Listen to this Discovery episode of the Conversation to hear about how Jeffery and his colleagues study reindeer eyes, why winter eyes are such a unique color and how light pollution can alter this finely tuned adaptation.

This article first appeared in听听on 21 December 2022.听

Links

• Original article in听
• 果冻影院 Institute of Ophthalmology
• 果冻影院 Faculty of Brain Sciences