Both gorillas and chimpanzees seem to be able to __________ in a rudimentary way, although they do not seem to do so in the wild.

Question

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Gorillas and chimpanzees have been trained to understand and manipulate symbols through sign language or visual aids, but they do not naturally use them in the wild. They also do not produce syntax or human verbal sounds, but they have shown some ability to understand recorded call systems.

Both Gorillas and Chimpanzees Seem to Be Able to __________