Q. Why can tigers, cats, and owls see in the dark?
A. Because they have the power of enlarging the pupil of their eyes, so as to collect several scattered rays of light; in consequence of which, they can see distinctly when it is not light enough for us to see any thing at all.
Q. Why do cats and owls sleep almost all day?
A. As the pupil of their eyes is very broad, daylight fatigues them; so they close their eyes for relief.
Q. Why do cats keep winking, when they sit before a fire?
A. As the pupil of their eyes is very broad, the light of the fire pains them; and they keep shutting their eyes to relieve the sensation of too much light.
Q. Why do tigers, cats, owls, &c. prowl by night for prey?
A. As these animals cannot see distinctly in strong daylight, they sleep during the day: and as they can see clearly in the dark, they prowl then for prey.
Q. Why do glow-worms glisten by night only?