Reblogged from NC Museum of Natural Sciences Education Blog:

Back in April we put our pond tank together. Aside from the usual things such as crushed coral, plants and fish (and unknown to us then, snails) we also added all of our protozoans, as well as pond invertebrates, such as rotifers, daphnia, tardigrades, and...planaria.

Since then we only know that it's been a survival of the "food chain" for all these creatures.

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