Humans are not the only animals that know how to use tools. For example, some chimpanzee groups use stones to crack nuts. This knowledge is passed from one generation to another as young chimpanzees watch older ones.
The process requires two stones: one as an anvil and another as a hammer. Choosing the right stones and cracking a nut between them takes logic and considerable practice. This became clear when a researcher who studied chimpanzees tried it. It took the researcher several hours to crack a first nut, a task an experienced chimpanzee can do in seconds.
Other groups of chimpanzees of the same species have not discovered this cultural skill. The nuts are too hard to crack with their teeth, so those groups do not eat them, even though nuts and stones are abundant. As different chimpanzee groups interact, knowledge about using different kinds of tools, such as this one, passes from one group to another.
I find it interesting to compare how new practices spread in human societies and in those of other primates. For example, a young female monkey once discovered how to clean sand from fruit by washing it in a river. The first monkeys in the community to copy her were her mother and the other young ones. Later, the other adult females began washing their fruit too. The last group in the society to adopt the new practice were the adult males, and I cannot help wondering whether this resembles human society.
More answers: Vegan Ethics FAQ.