10 fascinating animals without brains and how they survive

1. Jellyfish: Jellyfish lack a brain but use a nerve net to sense their surroundings, pulsing rhythmically while stinging tentacles capture drifting prey. (Image: Canva)

2. Starfish: Despite no brain, starfish use a decentralised nerve ring in their arms, enabling movement, regeneration. They feed on shellfish with surprising skill. (Image: Canva)

3. Sponge: Sponges filter seawater through pores, absorbing oxygen and nutrients. With no brain or nervous system, they thrive by passively sustaining marine life. (Image: Canva)

4. Sea Cucumber: Sea cucumbers survive without a brain by relying on simple nerve rings. They recycle nutrients, cleaning seabeds and supporting marine ecosystems. (Image: Canva)

5. Sea Lily: Sea lilies are ancient relatives of starfish. They are anchor to the seabed and wave feathery arms to catch plankton, surviving purely on instinct. (Image: Canva)

6. Hydra: Tiny freshwater hydra regenerate constantly. Their nerve net controls stinging tentacles, allowing them to paralyse prey despite lacking any central brain. (Image: Canva)

7. Comb Jelly: Comb jellies have no brain, instead they use specialised nerve cells and shimmering cilia to move gracefully and capture prey with sticky tentacles. (Image: Canva)

8. Brittle Star: Brittle stars coordinate movement through nerve rings, not brains. Their flexible arms help them scuttle quickly across seabeds, scavenging for food. (Image: Canva)

9. Coral: Corals are colonies of tiny polyps that function together. Though brainless, they build vast reefs, providing essential shelter for countless ocean species. (Image: Canva)

10. Flatworms: Flatworms navigate with sensory cells and absorb oxygen through thin skin. Even without brains, they reproduce, hunt, and adapt to their environments. (Image: Canva)