If viable drill egg on each side carefully, drain contents and rinse for children to see what it looks like.
Not unusual one doesn't hatch, possibly due to food or simply never going to....
Setting up time lapse would be interesting to rig up for butterflies or birds, simply never had the right equipment to do it properly.
We would do that with eggs for Easter. Put a tiny hole in each end and blow out the egg leaving an empty shell to dye.
I would imagine that time-lapse equipment would be a few bucks.
Children find most unusual things fascinating, small eggs like this more difficult to work with.
Sure most equipment is expensive especially here!