Do you know how you can look at yourself in the mirror and know that you are you? Well, animals can't always do that because they don't understand that the reflection they see in a mirror is actually them. This is why some scientists decided to study animals and see how they react to seeing their reflection in a mirror.
One of these scientists is named Jacques Derrida, and he decided to write a long story about his experiences observing a cat when it looked at itself in a mirror. He called this story "The Animal That Therefore I Am." In the story, Derrida explains that watching the cat look at itself made him think about how animals understand themselves.
You see, unlike you, animals can't understand themselves the same way that you do. They can't look in the mirror and say "Hey, that's me!" Instead, they might see a reflection and think it's another animal. Sometimes they might even get scared of their own reflection because they don't understand what it is.
But even though animals can't understand themselves like you can, they still know they exist. They know they're alive because they feel things, like hunger, fear and happiness. So, even if they don't understand what they look like, they still know they are themselves - just like you do.
In summary, "The Animal That Therefore I Am" is a story that tells us that animals might not understand themselves the same way that we do, but they still exist and have feelings just like us.