Humans are Terrifying

More seriously, humans do have a number of advantages even among Terrestrial life. Our endurance, shock resistance, and ability to recover from injury is absurdly high compared to almost any other animal. We often use the phrase “healthy as a horse” to connote heartiness - but compared to a human, a horse is as fragile as spun glass. There’s mounting evidence that our primitive ancestors would hunt large prey simply by following it at a walking pace, without sleep or rest, until it died...

 An Ape Reaches for the Moon

Of all the creatures who had yet walked on Earth, the man-apes were the first to look steadfastly at the Moon. And though he could not remember it, when he was very young Moon-Watcher would sometimes reach out and try to touch that ghostly face rising above the hills. He had never succeeded, and now he was old enough to understand why. For first, of course, he must find a high enough tree to climb.