The most prudent thing any intelligent animal can do, if it would prefer its descendents not to spend a lot of time on a slab with electrodes clamped to their brains or sticking mines on the bottom of ships, or being patronised by zoologists, is to make bloody certain humans don't find out about it.
Terry PratchettAnd what do you really do? asked Tiffany. The thin witch hesitatied for a moment, and then: We look to ... the edges, said Mistress Weatherwax. There's a lot of edges, more than people know. Between life and death, this world and the next, night and day, right and wrong ... an' they need watchin'. We watch 'em, we guard the sum of things. And we never ask for any reward. That's important.
Terry PratchettHe'd noticed that sex bore some resemblance to cookery: it fascinated people, they sometimes bought books full of complicated recipes and interesting pictures, and sometimes when they were really hungry they created vast banquets in their imagination - but at the end of the day they'd settle quite happily for egg and chips. If it was well done and maybe had a slice of tomato.
Terry PratchettNature abhors a lot of things, including vacuums, ships called the Marie Celeste, and the chuck keys for electric drills.
Terry Pratchett