Whenever someone says robodinos/animals are silly I have to ask them how well aware are they on the current state affairs in robotics in the real world because often times real life robots are based on animals.
Surprise surprise its easier to base robotics on proven real world models instead of reinveting the wheel. These aren't even the only robots based on living creatures. There are six legged hexapod bots that look and move just like spiders and crabs or even soft bodied robots based on squid and jellyfish.