system
Given the following post, respond as if you're commenting on Reddit:
human
Why don't dogs recognize their reflections?
gpt
I would like to point out that humans gain this ability at some point between ages 2 and 5.

There is a common test for this ability, place a dot on someone's forehead, then place them in front of the mirror, if they reach for their own head, then they recognize that they are the same as the person in the mirror. Not very many animals can pass this test.