Junior 4-H Rabbit Knowledge Practice Exam

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What is the purpose of the third eyelid in rabbits?

To improve night vision
To protect against water
To protect the cornea during a dust storm and still be able to see
To signal distress

The correct answer is: To protect the cornea during a dust storm and still be able to see

The purpose of the third eyelid in rabbits is not to improve night vision (option A) because rabbits are crepuscular animals and are most active at dusk and dawn, not necessarily at night. Additionally, it is not necessary for their survival as they have other adaptations for low light vision. The third eyelid also does not protect against water (option B) as rabbits have a nictitating membrane, or inner eyelid, that serves this purpose. Furthermore, the third eyelid does not serve to signal distress (option D) as rabbits have other behaviors and vocalizations to communicate distress. Therefore, the correct option is C, as the third eyelid protects the cornea during a dust storm while still allowing the rabbit to see. This is important for their survival as they are prey animals and need to be able to remain vigilant while protecting their eyes from environmental factors.