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Answer: Parrot
Why: Parrots produce human-like sounds using a specialized vocal organ called a syrinx rather than vocal cords.
Answer: Wheeking
Why: Wild cavies never make this food call: researchers say it came with domestication and is aimed at the keeper walking in.
Answer: Jacobson's organ
Why: Cats curl the upper lip and stretch the neck in the flehmen response, drawing scent-laden air over it behind the front teeth.
Answer: Three
Why: The third one, the nictitating membrane, sweeps in from the inner corner like a wiper blade and spreads tears across the eye.
Answer: Blue and yellow
Why: Dogs lack red-green cones, giving them dichromatic vision similar to human red-green color blindness.
Answer: Freeing trapped friends
Why: In the 2011 Science study the rats also opened a second container full of chocolate and shared the treat with the cagemate they had freed.