Canon autofocus is amazing to me, so I was surprised when I had a chance to photograph a pair of sandhill cranes up close and the camera would only briefly focus on the head at best. Then I looked at the pics and realized they have read eyes.
All in all I was impressed at how small a bird in the frame the autofocus would pick up.
Edit: this lack of emojis is giving me flashbacks to the '80s when the internet was still a twinkle in someones eye and arpanet hosted news groups were the cool kid on the block.