Jellyfish (In the Light of Theosophy)
Jellyfish, being one of the biologically simplest kinds of animal that lack brain, we would think that they cannot learn. Researchers had generally assumed that learning from experience and adapting a behaviour was limited to biologically complex animals with relatively large brains, which include mice, birds and primates. According to Jan Bielecki at Kiel University in Germany, “Learning is the pinnacle of nervous system performance.” But some studies have hinted that it is possible for simple creatures also to have this ability, and this led Bielecki and his colleagues to investigate learning in jellyfish, which has shown that Caribbean box jellyfish can learn from experience, even though they lack a central brain.