My favorite tapeworm-related fact is from Entangled Life [1]:

If you cut off a tapeworm's head, it loses its main ganglia [~brain]; but when the head/ganglia grow back, the tapeworm will still have environmental memories (e.g. how to solve a maze it had mastered, pre-decapitation).

[1] https://www.amazon.com/Entangled-Life-Worlds-Change-Futures/...

I picked up this book about fungi from a recent HN comment:

"Entangled Life: How Fungi Make Our Worlds, Change Our Minds & Shape Our Futures" by Merlin Sheldrake https://www.amazon.com/Entangled-Life-Worlds-Change-Futures/...

I'm happy to pass along that recommendation. I had no idea that fungi were so interesting.

The book takes some detours into panspermia theory that I found a little boring. There was also some pacing issues in many places. However, the interesting part about fungal life was so good that I would still recommend it.