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Animals can be rational. Humans can be irrational.
One acceptable definition of rationality in a discipline known as "Rational Choice Theory" defines rationality as "taking the shortest route to the goal." One can easily find examples of animals finding the most efficient way to obtain a given food source. Meanwhile, a human may stop to smell the roses on the way to the hunt. Stopping to smell the roses is an irrational act.

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The fact that animals don't express emotions doesn't mean they don't have any. They face the same reality as we do, but they receive it differently and, as their comprehension is limited due to physical reasons, their behaviour towards reality is also limited.
Furthermore, it's a question of degrees: humans' comprehension is also limited. Behind appearances humans also behave following the laws of nature they don't control.

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Last time I checked, humans are animals. Yes, that's right: much as we can make oureselves out to the most superior beings on the planet, we're animals just like the rest of them. In fact, we're primates too. Humans are not completely set apart from the rest of the organisms on Earth.

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Emotions are not at all unique to humans- they are very common in animals. You can perhaps talk about specific emotions being instinctive to specific species- but the 'basic' emotions of anger, fear, contentment AND love (as represented by parental investment and other social bonding) are quite common in non-human animals.

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