Marine-Inspired Car Design: Dolphin or Crab?

This might be a bit different from the usual topics here, but I’m fascinated by how nature solves problems. I’ve been wondering about designing a car based on marine life. On one hand, a dolphin’s sleek, hydrodynamic shape seems perfect for efficiency and speed. On the other, a crab’s rugged, stable build could inspire something incredibly durable and versatile for off-road conditions. Which creature’s traits do you think would translate into a more interesting or practical vehicle? I’d love to hear your thoughts on the balance between elegant performance and tough utility.