The depressing rule for yukkuris living in human territory... that is not making noise. Saying greetings and the like in a loud voice is out of the question. Fools who do such things will not be let off lightly by humans. Children playing, students seeking stimulation, people desiring an outlet, and Abusive Misters... Out of interest, to relieve boredom, to vent irritation, or just for fun... Yukkuris who are spotted by humans will be tormented without even knowing why. Their cries for help will reach no one, not even their own kind.
...[The others] haven't the slightest inclination to help some fool with no connection to them.