Just as vertebrates differ greatly in intelligence and sentience, invertebrates may differ greatly too.
What about shrimp? Their brains turn out to have memory and learning centers, which has triggered an evolution squabble.
Small animals amuse and amaze scientists who take a close look at them in action. Sometimes it requires a high-speed camera to analyze the trick.
Scientists debate whether ctenophores are the earliest animals to appear in the Cambrian explosion. If so, they arrived with multiple tissues, a nervous system, and a digestive system.
It often seems that the closer you need to look, the greater the wonder. It’s as if someone set it there to hide, waiting for us.