Other factors like ecological availability, reward-based factors, content-based factors, and source-based factors might explain the stability of animal culture in a wild rather than just imitation. As an example of ecological availability, chimps may learn how to fish for ants with a stick from their peers, but that behavior is also influenced by the particular type of ants as well as the condition. A behavior may be learned socially, but the fact that it was learned socially does not necessarily mean it will last.