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        Many animals are known to live and move in groups to secure food and avoid predators. Over the years, people have been curious about the way they deal with disturbances arising from the environment, and the operations underlying their responses as a group. Studies on jackdaws and turtle ants may provide some insights into the issue.

49. From (A) to (F) below, choose the ONES that are true for both jackdaws and turtle ants.（多選題，4分） (A) They have special strategies to locate food sources. (B) They have complex interactions led by a leader. (C) They share information with their group members. (D) They establish rules to stay away from enemies. (E) They change their nesting sites from time to time. (F) They show behavior governed by a unique system of communication.

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