Reindeer Eye Adaptations and Functions

The video explores the phenomenon of eye shine in animals, focusing on the tapetum lucidum, a reflective tissue in the eye. It highlights the unique adaptation of Eurasian mountain reindeer, whose eye color changes from golden yellow in summer to deep blue in winter. This adaptation helps them see in the prolonged darkness of Arctic winters. The video explains the mechanism behind this color change, involving pupil dilation and pressure changes that compress collagen fibers in the eye. This compression alters light reflection, enhancing the reindeer's night vision at the cost of some visual clarity.

What is the function of the tapetum lucidum in animals?

• To absorb more light

• To produce light

• To change eye color

• To protect the retina

Which animal is known for changing its eye color seasonally?

• Snowy owl

• Arctic fox

• Eurasian mountain reindeer

• Polar bear

Why do reindeer pupils remain wide open during winter?

• To change eye color

• To let in more light

• To reduce eye pressure

• To see UV light

What causes the reindeer's eye color to change from yellow to blue?

• Temperature changes

• Collagen fiber compression

• Dietary changes

• Genetic mutation

What is the main benefit of the reindeer's eye color change?

• Enhanced UV light detection

• Faster movement

• Better color perception

• Improved night vision

What is the downside of the reindeer's eye adaptation for night vision?

• Blurriness in vision

• Increased eye pressure

• Reduced color vision

• Inability to see in daylight

What percentage of light do reindeer eyes reflect in winter?

• 40%

• 95%

• 60%

• 75%

What phenomenon explains the color change in reindeer eyes?

• Snell's Law

• Newton's Law

• Ohm's Law

• Bragg's Law

How do reindeer eyes adapt to the long Arctic nights?

• By reducing eye size

• By closing their eyes

• By changing eye color

• By increasing eye temperature

What is the primary reason reindeer can see in near-total darkness?

• Their eyes produce light

• Their retinas absorb more light

• Their eyes are larger

• Their eyes are closer together