sociability as much a law

As soon as we study animals — not in laboratories and museums only, but in the forest and the prairie, in the steppe and the mountains — we at once perceive that though there is an immense amount of warfare and extermination going on amidst various species, and especially amidst various classes of animals, there is, at the same time, as much, or perhaps even more, of mutual support, mutual aid, and mutual defence amidst animals belonging to the same species or, at least, to the same society. Sociability is as much a law of nature as mutual struggle.

- Mutual Aid, Peter Kropotkin (1902)