I found this awesome little educational life cycle craft at Kidzclub.com. There is one egg to animal cycle for frog, butterfly, and duck.
Here’s the ones for the frog and the butterfly. I think the images are some of the best ones out there, realistic enough and easy to color in.
I printed out the pieces on cardstock, colored the life cycle stages, cut and glued on the appropriate spaces (you can enlist your little explorers to help with this) and laminated the front and back pieces to make them more durable, then used my scrapbooking tools to make the hole in the center of the two disks then fastened them with a scrapbooking brad.