C) Being a major source of animal intelligence.

C） 是动物智力的主要来源。

Since animal intelligence is difficult to directly compare.

由于动物智力很难直接比较。

We've been talking about animal cognition-the study of animal intelligence.

我们已经说过动物认知了——动物智力的研究。

Do we have the tools to understand animal intelligence? Can we really know which animal is the smartest?

我们有了解动物智力的工具吗？我们真的能知道哪种动物最聪明吗？

And even though experts, don't actually like to directly compare animals intelligence. A rubric like this can help us understand just what we know now.

而且即使是专家， 其实也不喜欢直接比较动物的智力。像这样的标题可以帮助我们理解我们现在所知道的。

York University professor Kristin Andrews, who researches animal intelligence, suggests that there are lots of cognitive tasks – remembering how to get food, recognising objects or other beings – that animals do without necessarily being self-aware.

约克大学研究动物智力的教授克里斯汀·安德鲁斯认为，动物在没有自我意识的情况下也能完成许多认知任务，例如记住如何获取食物、识别物体或其他生物。