Couldn't start my breakfast without knowing. My second little kitten found her way behind our
fridge upon her arrival at our apartment. We lived on the 18th floor and were shaking in our boots thinking that she had fallen over the balcony. We looked everywhere, in the apt and on the ground, but failed to look along that tiny crack beside the fridge.
I was so sad, but later that morning, out she came, same way as she went in. Small animals, particularly are very flexible. Later, she used to jump from one balcony to another to visit neighbours, through upright rails that were 5" apart, over a 20" gap of 18 floors below. Freaked me out completely. She was still going strong 21 years later.
I had a baby raccoon trapped in the gate here, with his mom just 1 1/2 feet away. I guess he had grown a bit since the last time he went through. He was completely stuck but I of course, had to rescue him at any risk. I was afraid the mom would attack me. But she didn't, I bent down and opened the gate for him, she just sat there, out he trotted and followed me all summer long.