Darwin’s dry sense of humor is captivating. Consider the following entry (Darwin 1897, 191) : “We see him (the dog) on bare pavements scratching backwards as if to throw earth over his excrement, although, as I believe, this is never effected even when there is earth.”
Heh! The picture of it!
Check out this passage as Darwin quotes Isidore Geoffroy Saint-Hilaire (Darwin 1897, 25):
“Jackals, when tamed and called by their master, wag their tails, lick his hands, crouch and throw themselves on their backs; they smell at the tails of other dogs, and void their urine sideways; they roll on carrion or on animals which they have killed; and lastly, when in high spirits, they run round in circles or in a figure eight, with their tails between their legs.”
Darwin, Charles. The variation of animals and plants under domestication, Volume I. New York: D. Appleton and Company, 1897.