A few years ago, we had hornets that were so big that when my little ones first spotted them, they ran to me telling me that there were flying monsters THIS BIG (their arms outstretched to the max) coming into their room.
Frankly, they looked even bigger to yours truly.
They must have folded their wings in order to climb inside. Even Hitchcock couldn't picture these!
The room shook when they buzzed.
Slammed the window shut on them and called hubby in a panic to say we've been invaded.
The exterminator came the next morning (sleepless night) and most probably used VX to kill them. They had built a small hive (hard as a rock) inside the upper edge of the outer window box.