Hi Tracy
It depends on the type of fern, some are and some are not. Boston fern (Nephrolelpsis exalta bostoniensis) is not toxic.

There are many references in books and on the internet to Egyptians, Persians, Phoenicians and Chinese who believed the world began from an enormous egg. They celebrated this symbol of the universe by dying and exchanging eggs, especially red ones. In pre-Christian era, a New Year feast in Persia was known as the Feast of the Red Egg. It is speculated that coloring eggs was introduced to Western Europe when the Knights of Crusades and missionaries brought the idea back with them.