Jumping genes used to be dismissed as junk DNA which in turn was held to be slam-dunk evidence for unguided evolutionary processes.
We have tended to assume that intelligence rose with the development of a spinal cord and brain (vertebrates), and warmbloodedness (mammals and birds).
Just as vertebrates differ greatly in intelligence and sentience, invertebrates may differ greatly too.
Even compared to each other, the genomes of three cephalopods studied had been broken up and extensively reorganized.
Recent research has shed light on the intriguing strategies that spiders use to deceive other spiders — and prey in general.