Why are there two tails to some comets? Why do we have blood? Why are frogs said to have two lives? Why do cats sniff each others noses? Why are the testes located in the scrotum? Why do human nails grow so long? Why do frogs have long legs? Why would a dog have a dry nose...
Hibernating frogs have built-in natural antifreeze Although ice crystals form under the skin when frogs hibernate in the winter, a high concentration ofglucose occurring naturally in the frog's organs prevents the animal from freezing. Even when a deep freeze causes the frog's heart to stop beat...
They change shape and color, and squirt ink. But they also will return your gaze, "as if they're scrutinizing you."
do the hounds frightenyou so?"She smiled, and said: "I know full well, my son, that all you sayis true. I have the advantages you mention, but when I hear eventhe bark of a single dog I feel ready to faint, and fly away asfast as I can." No arguments will give courage to ...
Other animals do exhibit a wider range of sexual and social systems than do mammals alone. Whereas the young of most mammal species receive maternal care but no paternal care, the reverse is true for some species of birds, frogs, and fish in which the father is the sole caretaker for his...
根据第一段“Why does the giant squid (乌贼) have eyes as large as a football? Why do more than 350 species of fish produce their own electricity? Why do dogs become more optimistic after two weeks of plentiful sniffing (嗅)? (为什么巨型乌贼的眼睛有足球那么大?为什么超过350种鱼类能自己发...
Explain why frogs cannot live in salty waters. Why do coniferous plants have thin and needle-like leaves? Thoroughly explain why zebras don't get ulcers. Why do all flowers produce pollen, but not all produce nectar? Compare and contrast vision with electro-reception. Why do animals with...
Time moves on and we visited our local shelter and found these two sisters: We gave them the names Misty and Sam (those big white whiskers reminded me of Yosemite Sam!). At first JB was not happy – he chuffed and he hissed and he would have nothing to do with the little usurpers....
"This they would sing, as a chorus, to words which to many would seem unmeaning jargon, but which, nevertheless, were full of meaning to themselves.I have sometimes thought that the mere hearing of those songs would do more to impress some minds with the horrible character of slavery, ...
You have to be a bit lucky to capture such photos: you have to happen to catch both birds at the same time. When you usually catch five or fewer birds at a time, as we do, the chances that any two of them will be an informative comparison becomes small. Each of these pair photos...