You probably take for granted that whenever you want, you can literally glance at a slab of glass and see an exact image of what you look like.
Animals are not so jaded.
These perplexed animals really remind you that mirror technology is impressive. It's understandable why the bird gets so confused and the gorilla gets so mad. I mean, how cool and weird is it to look straight ahead and see the appearance of an identical being who looks how you look and moves when you move? So maybe next time we're casually glancing in a mirror acting all blasé like the elephant, we should take a lesson from the leopard and engage with our fascinating surroundings.