Robot Fish that really looks like a real fish

Here's another robot animal. It's a blue fish that swims like a real one. But you will know that it's a fake fish or robot fish when you see its mouth. It has sensors which it detects the environment in front of it, so that it won't crash the tank. On this video, it seems to be in a fish aquarium in a science center. Children and adults find it real until they see the sensor of this robot fish.