One other idea that we tried out a while ago involved frog spawn. The kids had done the usual trip to their grandma’s pond and collected some frogspawn. The idea being you watch it hatch out and then release it back to the pond it came from. We thought it would be an interesting idea to set up a camera and take a timelapse of the process. It’s not hard. A home computer,a webcam and some inexpensive or free software usually is enough. We set this up in the kitchen with a fluorescent light and left it for about a week, taking one photo every 30 minutes. The result is quite stunning.
We uploaded it to youtube and you can see it here.