Hi Martha, I like to use this example with bees.
If you imagine a frame full of brood containing 6,000 bees all squeezed into the confines within a frame & then within a few days they all exit that frame, stretching their legs & wings outside the confines of that frame, it’s easy to see how a hive’s population can quickly blow out.
Imagine how quickly that happens when a colony has 5or6 or even more of those frames ready to hatch in a short space of time.
Using this video to illustrate: I measured my lounge room which works out to be roughly 240 sq.ft. Assuming that glass box is 2 sq.ft. That means I can fit 120 of those glass boxes containing a contortionist into my lounge room (one layer), assume we only have the same head room as the size of the box & then asked them all to exit the boxes, they would spill out into the hallway & out the front door, in order to be able stretch their arms & legs.