Pufferfish are clumsy swimmers which will fill their elastic stomachs with huge amounts of water & air to blow themselves approximately various situations their typical dimension. The Hallucigenia is an elongated, worm-like creature with spiney oppendages through its system. They went extinct all around 485 million a long time ago, https://expressbookmark.com/story18591490/fish-tank-cleaner-an-overview