In spite of the shallow water (and probably because of it), it's been a good pond for frogs, dragonflies, and birds.
|heron and azolla in the Meadow pond|
It's interesting to consider how it's colonized the pond.
I'm thinking that it may have come in with some of the semi-aquatic plants that were transplanted on the edges of the pond at the end of a research project. But, that's just a guess.
Click on the photo for a closer look.
Note: this is a duplicate post from my blog, Natural Gardening.