Just as he begins his jump lots of grouse flew out from the bushes. He was so startled he landed in the water. The grouse laughed at him saying their name as they went away. That's the length of that story about the Startlers. Without a common language there would be no culture.
Culture is learned during the course of a person's life.
More important, however, is the idea that culture is acquired while growing up. Acquiring a culture is mostly an unconscious activity while learning involves conscious effort. No amount of formal training can help in the acquisition of culture. Yet, a child growing up acquires both language and culture with few problems needing formal schooling only for the technical skills of reading and writing at a later date to complete their education. In an oral tradition such as those of the Native Americans culture was passed on through the use of language in ceremonies, daily activities and stories.