The Next Generation
You might recall that I visited The Butterfly Conservatory in Massachusetts. While there, I purchased this egg case
housed in a sealed plastic container.
The instructions say keep it in the fridge till the 15th of April,
then transfer it to a room temperature location and wait.

Approximately 100-300 babies will hatch in May (4-6 weeks). It's extremely important to take the container outside to the garden quickly and sprinkle them around, because overcrowded babies will begin to eat each other if you don't.
Yikes!
and
Be sure to see the exquisite flower Mantis's
.