So the duck eggs never hatched; it turns out that the students left the incubator uncovered during a sunny day. In our greenhouse of a lab, that resulted in some hard boiled duck eggs. But that is part of the learning process, and those students will never leave an incubator with fertile eggs in direct sunlight again…of that I am certain.
Monday May 18, I did receive a slightly different type of surprise. The snakes had actually mated earlier in the Spring and Cleo laid her first clutch of eggs. Many were not viable by the time I was able to get there, and a few had bn laid in the water dish and swelld up with excess fluid. One of them, however seemed to be in just the right place.
I separated them from the main tank and placed them into a container with wet Perlite to keep them consistently moist and warm. Some basic internet searching suggests that the eggs will develop and hatch in ~50 days, somewhere about July 20.