Agility
Squid are very rapid swimmers, using a form of jet propulsion. They fill their internal cavity (unconstrained by a shell) with water and then expel it quickly in a jet, enabling them to leap upon their prey. With these adaptations, squid became highly successful without a protective shell; smarter, able to hide, and very quick to respond. There are now over 300 different species of squid and they are found in all the oceans of the world.
Looking at the current state of cyber security investment, we are still in the Jurassic Period. Most of the spending, some 70%, is still on prevention, which is a defensive shell strategy. This is changing. Cyber security investment is growing fast in other areas such as response and monitoring, so a more even spread is expected in the future.