Does the giraffe know what he's for? Or care? Or even think about his place in things? A giraffe has a black tongue twenty-seven inches long and no vocal cords. A giraffe has nothing to say. He just goes on giraffing.

That's just how time travel looks like to the untrained eye. The reason why there aren't more travelers is that your average physicist refuses to be eaten by a giraffe in the name of science.

We know that there are many animals on this continent not found in the Old World. These must have been carried from here to the ark, and then brought back afterwards. Were the peccary, armadillo, ant-eater, sloth, agouti, vampire-bat, marmoset, howling and prehensile-tailed monkey, the raccoon and muskrat carried by the angels from America to Asia? How did they get there? Did the polar bear leave his field of ice and journey toward the tropics? How did he know where the ark was? Did the kangaroo swim or jump from Australia to Asia? Did the giraffe, hippopotamus, antelope and orang-outang journey from Africa in search of the ark? Can absurdities go farther than this?