There are two vernal pools in the woodlot I recently donated to the Kennebec Land Trust. I always enjoyed checking out those pools and seeing what was using them.
It turns out that vernal pools are very important to a whole bunch of critters.
I encourage you to read the recent column about vernal pools from the Department of Inland Fisheries and Wildlife.
You can read that column here:
https://www1.maine.gov/wordpress/insideifw/2019/06/17/vernal-pools-and-lands-program-management/