today i learned – thurs 1st mar 2018

soooooooo, if you haven’t heard, the uk is currently in the grips of ‘the beast from the east’ 👹

basically, siberia decided to share their snow with us … which was nice of them 😁 i was going to save this fact, but it seems relevant 🤷🏻‍♂️

#tdil that reindeer eyes change colour throughout the year 👀

see: reindeer … snow … totally correlates! 😏. also, it’s super interesting and i’ve wanted to learn about it for ages 🙌🏻

anyway, back to the fact! when the year turns from winter to the other seasons, the eyes of the majestic reindeer change from blue to gold 😱

it happens due to the harsh arctic climate and the fact that reindeers spend part of their winter in constant darkness and part of their summer in constantly daylight (just because that’s the way it works 👍🏻)

in the winter, reindeers need super night vision (so they can see). this happens because a layer of tissue behind the retina becomes less reflective and appears blue.

this less reflective tissue increases the eye’s sensitivity to the limited light and makes it so that the reindeer can see things and not get eaten from predators! #ideal

in the summer, the bright light is reflected off the very same tissue that i mentioned above, this causes them to look gold (gold, always believe in your soullllllll 🎵)

the way that the tissue in the retina becomes more and less reflective is all down to pressures and stuff and is really complicated … as i’m feeling a tad lazy and won’t explain it well, go ->here<- to find out more 😏

right, that’s us done for today crazy happy people 😘 you’re now a little smarter than you were before 🤓

class dismissed 👨🏻‍🏫 #tdil

_______

this one feels brief but still interesting 🤔 if you fancy reading some other stuff, just take a wander over ->here<-

(picture times! image one is ->here<-, image two is ->here<- and the header is ->here<-)

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