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Bottlenose dolphins possess advanced language comprehension skills, making them able to understand signed gestures, generalized words like "ball," and can also refer to sets of objects with similar characteristics.
Earth is full of a wide variety of creatures.
Chimpanzees cooperate to acquire new territory, killing individuals from rival groups.
"The most shocking has to be that the orangutan genome hasn't changed in 15 million years. To put that in some perspective, our species didn't even really exist until 200,000 years ago, and even the Homo genus doesn't stretch much further back than 2.4 million years.