1. Part of the reason is that you are human, and so you are more familiar with humans and more advanced in recognizing humans than recognizing individuals from other species. But even with that, there are many times where we find a lot of people looking the same, especially foreign people.
2. In the other hand, animals don’t look the same to me. May be because they are divided into smaller groups that you don’t realise they are the same species e.g. dogs. [https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Collage_of_Nine_Dogs.jpg/800px-Collage_of_Nine_Dogs.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Collage_of_Nine_Dogs.jpg/800px-Collage_of_Nine_Dogs.jpg)
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